The maternal parentage of Marared/Margred/Margaret, daughter of Llywelyn has not been definitively determined, as this discussion between medievalists will attest:

https://groups.google.com/forum/#!topic/soc.genealogy.medieval/2qOq...

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B: 1202 1210 1215 1218
alternate birthplace: Abeffraw Castle, Gwynedd, Caernarvonshire, Wales

Margaret ap Llywelyn is the daughter of Llywelyn ap Iorwerth, Prince of North Wales. 

She married, firstly, John de Briouze, son of William de Briouze.

She married, secondly, Walter de Clifford, son of Walter de Clifford and Agnes de Cuni.

Child of Margaret ap Llywelyn and Walter de Clifford

   * Maud de Clifford d. bt Dec 1282 - 9 May 1285

Children of Margaret ap Llywelyn and John de Briouze

   * John de Briouze

* Sir William de Breuse, 1st Lord Brewes+1 b. b 1227, d. 6 Jan 1290/91
http://thepeerage.com/p413.htm#i4125

   * Sir Richard de Breuse b. b 1232, d. b 18 Jun 1292

Margred verch Llewelyn1

b. circa 1207, d. after 1263

Father Llewelyn Ap Iorwerth, Prince of North Wales1,2,3 b. 1173, d. 11 April 1240

Mother Joan Plantagenet1 b. circa 1188, d. February 1237

    Also called of Gwynedd. Margred verch Llewelyn was born circa 1207 at Caernarvonshire, Wales.1 She was the daughter of Llewelyn Ap Iorwerth, Prince of North Wales and Joan Plantagenet.1,2,3 Margred verch Llewelyn married John Tadody de Braose, Lord of Bramber and Gower, son of William de Braose and Maud de Clare, in 1219; Her 1st. 1st cousins, 2x removed.1,2,3 Margred verch Llewelyn married Walter, 3rd Lord Clifford, son of Walter, 2nd Lord Clifford and Agnes de Cundi, circa 1234; Her 2nd. Margred verch Llewelyn died after 1263 at Clifford Castle, Herefordshire, England.1

Family 1

John Tadody de Braose, Lord of Bramber and Gower b. 1198, d. 18 July 1232

Children

William IV de Braose, Lord Bramber+ b. 1220, d. 6 Jan 1290/911,2,3

Richard de Braose b. c 1222, d. b 18 Jun 12923

Family 2

Walter, 3rd Lord Clifford b. circa 1164, d. 1263/64

Child

Maud de Clifford+ b. c 1234, d. a Dec 12822,4

Citations

[S245] LDS.

[S603] C.B., LL.D., Ulster King of Arms Sir Bernard Burke, B:xP, pg. 72.

[S642] Braose Family Web, online http://freespace.virgin.net/doug.thompson/BraoseWeb/

[S603] C.B., LL.D., Ulster King of Arms Sir Bernard Burke, B:xP, pg. 122.

The mother of most of Llywelyn's illegitimate children is known or assumed to have been Llywelyn's mistress, Tangwystl Goch (c.1168–1198). Gruffydd ap Llywelyn (c.1196–1244) was Llywelyn's eldest son and is known to be the son of Tangwystl. He married Senena, daughter of Caradoc ap Thomas of Anglesey. Their four sons included Llywelyn ap Gruffydd, who for a period occupied a position in Wales comparable to that of his grandfather, and Dafydd ap Gruffydd who ruled Gwynedd briefly after his brother's death. Llywelyn had another son, Tegwared ap Llywelyn, by a woman known only as Crysten.

Marared ferch Llywelyn (c.1198–after 1263) married John de Braose of Gower, a nephew of Reginald de Braose, and after his death married Walter Clifford of Bronllys and Clifford.

Margaret of Wales (1230-1268) [Pedigree]

Daughter of Llywelyn Fawr "the Great" Prince of Wales Prince of Gwynedd, Aberffraw, Lord Snowdon (1173-1240) and Joan of North Wales Princess of North Wales (1201-1237)

   b. ABT 1230

d. AFT 1268
Married first John de BRAOSE Baron Brembye (1197-1232)

Children:

William de BRAOS Lord Buckingham (1220-1291) m. Aliva de MULTON (1255-)

Sir Richard de BRAOSE Lord Stainten Manor (1232-1292) m. Alice le RUS (1245-1300)

John de BRAOSE (1232-)

Married second Walter IV CLIFFORD Lord Corfham (1194-1263)

Children: [listed under entry for Walter IV CLIFFORD]

References: [GENSERV],[CP],[EnglishP],[APC],[MCS4],[ConverseA], [MC]

Additional Source: "Pedigree Resource File," database, FamilySearch (http://familysearch.org/pal:/MM9.2.1/SPCP-MR7 : accessed 6 September 2012), entry for Margred Verch /Llywelyn/.

Margaret "Margaret of Wales" de Clifford formerly ferch Llywelyn aka de Brewes, de Braose, Brewes Margred "Margaret of Wales" Verch Llewelyn

Wife of John (Braose) de Brewes — married 1219

Wife of Walter (Clifford) de Clifford — married before 2 Nov 1234

Margred verch Llewelyn

http://our-royal-titled-noble-and-commoner-ancestors.com/p224.htm#i...

https://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=82545525

https://www.wikitree.com/wiki/Ferch_Llywelyn-5

Born about 1208 in Caernarvonshire, Wales [uncertain]

Daughter of Llywelyn ap Iorwerth and [mother unknown]

Sister of Gruffydd ap Llywelyn [half], Gwladus (ferch Llywelyn) de Mortimer [half], Ellen ferch Llewelyn [half], Gwenllian (ferch Llywelyn) de Lacy [half], Tegwared y Baiswen (Llewelyn) ap Llywelyn, Angharad (Llewellyn) Maelgwyn [half], Dafydd ap Llywelyn [half], Agatha Verch Llywelyn [half], Susanna ferch Llywelyn [half], Helen (Llywelyn) ferch Llywelyn and Tegwared Ap Llewelyn [half]

Wife of John (Braose) de Brewes — married 1219 [location unknown]

Wife of Walter (Clifford) de Clifford — married before 2 Nov 1234 [location unknown]

Mother of Lucia (Clifford) de Saye, John (Braose) de Braose, William (Braose) de Braose, Llywelyn (Braose) de Braose, Roger (Braose) de Braose, Hugh (Braose) de Braose, Richard (Braose) de Brewes Knt, Maud (Clifford) Giffard, Emma (Clifford) de Clifford and Roger (Clifford) de Clifford

Died after 1268 in Clifford Castle, Herefordshire, England

Biography

Margaret ferch Llywelyn, daughter of Llywelyn ap Iorwerth,[1] married (1) in 1219 John de Brewes, (2) before 2 Nov. 1234 Walter de Clifford[2] (married after 1232[3]).
John de Briouse, Lord of Bramber and Gower, was the son of William de Briouse & his wife _____[4] (also de Brewes, Breuse, Brause, etc.,[5] de Braose,[6] and Bruse[7]). John was born about 1197 (aged 22 in 1219), son of William by Maud de Clare.[5]
Her children with John de Brewes[5][2] (John de de Briouse Lord of Bramber and Gower[8]):
William,[8] Knt., 1st Lord Brewes, married (1) Aline de Multon, (2) Agnes de Moels, (3) Mary de Roos[5]

   Richard (born before 1232[8]), Knt., married Alice le Rus[5]

   Llywelyn de Brewes[2][5][9]

   John de Brewes, married Margery ____[5][2][9] 

John was "killed by a fall from his horse near Bramber, Sussex shortly before 16 July 1232".[5]
After her first husband's death in 1232, Margaret married before 2 Nov. 1234 Walter de Clifford, Knt., of Clifford, Herefordshire, Cortham (in Diddlebury), Shropshire, Caenby, Lincolnshire, etc., and Bronllys, Breconshire, etc., Sheriff of Herefordshire, Constable of Cardigan and Carmarthen Castles, son and heir of Walter de Clifford, of Clifford, Herefordshire, by Agnes de Cundy,[8] daughter and heiress of Roger de Condet of Caenby and Glentham, Lincolnshire.[5][10]
Margaret and Walter had one daughter:[5]
Maud (Matilda[11]%29 de Clifford, marred (1) William Longespée, Knt., (2) John Giffard, Knt., 1st Lord Giffard[5] (John Giffard had abducted her.[12])
Walter de Clifford, Knt.,[5] died December 1263[8] (shortly before 23 Dec. 1263[5]). Margaret was still living in 1268.[5]
"At her death, her heart was buried in the church of Aconbury, Herefordshire."[5]
Estimated Birth Date
No estimate of Margaret's birth year is found in Norr, Cokayne, or Richardson.
Margaret married 1219. Her first son by John de Brewes, William, is said to have been of "full age 15 July 1245,"[2] thus born by 1224. "Though he was allowed to succeed his father in 1232, before 18 July, he is not stated to have been of full age in the Fine Rolls until 15 July 1245."[13]
One method of estimation would be to assume, given the facts above, that son William was conceived in 1223 and that the marriage, though arranged earlier, was first consummated in 1223, when Margaret achieved the age of 15. This would place Margaret's birth at 1208. Since she is not recognized by Cawley as a daughter of llywelyn's wife Joan, Margaret's mother would have been one of llywelyn's mistresses. This is consistent with other estimates of her birth year. Day-1904 18:46, 26 February 2016 (EST)

   John de Braose was killed at Bramber 16 July 1232, having been bruised in a fall from his horse [Curia Regis Rolls, 490-1; CCR 1231-4, Hen. III, 2:86; Brut (1860), p. 320-1; Brut (1952), p. 102; Brut (1955), p. 231].[13] 

The lands, wardship and marriage of William de Braose, son and heir of John, was in the hands of various nobles until he came of age in 1241, indicating a birth year of about 1220:[13]
Peter des Riveaux was first custodian [see CCR 1231-4, Hen. III, 2:86; CPR 1225-32, Hen. III, 2:490].

   Henry de Turberville was granted the lands and marriage in March 1234 [CPR 1232-47, Hen. III, 3:41, 45].

   Richard Siward was granted the same in July 1234 [CPR 1232-47, Hen. III, 3:61].

   Richard, Earl of Cornwall, the King's brother, was granted the custody, lands and marriage of William de Braose in January 1234/5 until 1241, when William came of age [CPR 1232-47, Hen. III, 3:89; CCR 1234-7, Hen. III, 3:41; CChR 1:192]. 

b 1205 if 15 at birth of first child by John Braose was born in 1220[14]
If Margred/Margaret were older, would it not be more logical to conclude she was a daughter of a concubine, such as Tangwystl ferch Llywarch Goch (mother of Llywelyn's eldest son Gruffudd), rather than a child of this daughter of the King of Man?"[13]
Richardson, 2009, Gen-Medieval Archives: "I think it is a fair assumption that Llywellyn's daughter, Margaret, was born right about 1205, as she had her first known Braose child in 1220. That's providing Margaret was 14 when her marriage was consumated and 15 when she gave birth to her first known child. If correct, then Margaret would have been born right in the time period Llywellyn was married to the Isles girl."[15]
Llywelyn ap Iorwerth, Prince of North Wales, Prince of Aberffraw, Lord of Snowden, and father of Margaret ferch Llewellyn, was born in 1173.[2] Margaret married her first husband in 1219.[5] Therefore, Margaret was likely born between 1190 and 1203, being the dates of (1) her father's maturity and (2) the latest year she may have been born and been at least 16 years old at her wedding.[16]
Note - in the 11th century, Welsh women consummated their marriage as early as 14.[17]
Disputed Mother

   Margred's parents were Llywelyn the Great and... 

unknown[18]

   unknown mistress[3][2]

   Tangwystl ferch Lywarch (known mistress)[19]

   Joan of England[20][19][21]

   daughter of King of Man,[22][23][24] Rǫgnvaldr Guðrøðarson, widow of Rhodri ab Owain, Llywelyn's uncle[25] 

Richardson, 2009, Gen-Medieval Archives: "The subject of the maternity of Llywelyn's daughter, Margaret, could doubtless occupy many posts here on the board. As best I understand the evidence, Margaret was a bit older than Llywelyn's two daughters by Joan, Gladys and Ellen. If we accept the possibility that Margaret might be Joan's daughter, it makes things EXTREMELY crowded in the nursery at the beginning of Llywelyn's marriage to Joan. Besides Gladys and Ellen, Llywelyn and Joan also had their son and heir, David, at the first part of their marriage. I frankly can't possibly see how Margaret would fit chronologically to be Joan's daughter. Margaret either has to be the child of one of Llywelyn's earlier two marriages or else illegitimate. My opinion (not conclusion) is that Margaret fits best as a child of her father's marriage to the Isles woman. That's my opinion. Not a conclusion. I'm certainly open to further discussion and hopefully new evidence. ...

   "Likewise, having an Isles mother would have afforded her the kinds of connections which would have made her a desirable match for the Braose family."[26] 

Sources

   ↑ Joan of England was Llywelyn's wife, but may not have been the mother of Margaret (see "Disputed Mother" above).

   ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Douglas Richardson, Royal Ancestry: A Study in Colonial and Medieval Families, 5 vols., ed. Kimball G. Everingham, (Salt Lake City, Utah: the author, 2013), volume V, page 298; volume 1, pp 530-532

   ↑ 3.0 3.1 Margaret ferch Llywelyn, Foundation for Medieval Genealogy (#FMG)

   ↑ "The Chronicle of the Princes of Wales records that 'John de Bruse married Margaret the daughter of Llywelyn son of Iorwerth' in 1219" (John de Briouse, #FMG)

   ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 5.10 5.11 5.12 5.13 5.14 5.15 Douglas Richardson, Magna Carta Ancestry: A Study in Colonial and Medieval Families, Royal Ancestry series, 2nd edition, 4 vols., ed. Kimball G. Everingham, (Salt Lake City, Utah: the author, 2011), volume I, pp 316-318

   ↑ Gruffudd ap Cynan (#Bartrum)

   ↑ Brut y Tywysogion, Jesus MS 111 (Red Book of Hergest), retrieved 2014-06-08, amb

   ↑ 8.0 8.1 8.2 8.3 8.4 Foundation for Medieval Genealogy (#FMG)

   ↑ 9.0 9.1 sons Llywelyn and John are not listed by #FMG

   ↑ #Richardson says as his 2nd wife, but #FMG (Walter de Clifford) does not show a previous wife for him. He was her second husband.

   ↑ Walter Clifford (#FMG)

   ↑ soc.genealogy.medieval post, October 1999, by "pcr"

   ↑ 13.0 13.1 13.2 13.3 soc.genealogy.medieval post, October 1999, by "pcr"

   ↑ Douglas Richardson's Gen-Medieval Rootsweb post, Oct. 5, 2009

   ↑ Gen-Medieval Rootsweb post, Oct. 5, 2009, by Douglas Richardson

   ↑ analysis/conclusion added by April Dauenhauer, August 2, 2015

   ↑ See "Minimum Age for Welsh Kingship in the Eleventh Century," by Darrell Wolcott, posted by The Center for the Study of Ancient Wales

   ↑ Dictionary of National Biography, Llywelyn (p 13)

   ↑ 19.0 19.1 Gruffudd ap Cynan (#Bartrum)

   ↑ Margred, Rootsweb entry from the database for Celtic Royal Genealogy, the Turner-Thomas site "which is a definitive, well researched site" (according to Prof. Myron Wyn Evans, in his book O Hudd Ei Ddoe (2012).

   ↑ Penman blog post: "Although opinion is divided over the mothers of Gwladus, Gwenllian, Margred and Susanna, the majority of the genealogists I have studied lean towards their mother being Joanna." (accessed Feb. 13, 2016)

   ↑ Richardson in 1999 Gen-Medieval forums for example

   ↑ Richardson refers to her in his 2009 Gen-Medieval posts as the Isles girl, woman, mother.

   ↑ Ynys Môn (see Wikipedia: Anglesey)

   ↑ Wikipedia: Rǫgnvaldr Guðrøðarson & Rulers of the Kingdom of the Isles (accessed Feb. 14, 2016); see also "The Kings of the Isle of Man," compiled by Stewart Baldwin, note 3

   ↑ Gen-Medieval Rootsweb post, Oct. 6, 2009, by Douglas Richardson

Foundation for Medieval Genealogy (FMG/#MedLands):

       Margaret ferch Llywelyn

       John Briouse

       Walter Clifford 

   The Bartrum Project (digitization of "Welsh Genealogies AD 300- 1500" by Peter C. Bartrum)

   Margaret of Wales, "Our Royal, Titled, Noble, and Commoner Ancestors and Cousins" (website, compiled by Mr. Marlyn Lewis, Portland, OR; accessed September 30, 2015), citing The Complete Peerage, by Cokayne, Vol. V, p. 642; Some Early English Pedigrees, by Vernon M. Norr, p. 68 and Richardson (MCA and Royal Ancestry).

   "The mother and daughters of Joan of Wales," Plantagenesta (accessed Feb. 13, 2016) 

Other references:
UK and Ireland, Find A Grave Index, 1300s-Current about Margred Verch Llewelyn. Source Information: Ancestry.com. UK and Ireland, Find A Grave Index, 1300s-Current [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2012. (Accessed 25 December 2014). Original data: Findagrave, Data not sourced, inaccurate. Do not use this for a source for Margaret of Wales.
Web: Netherlands, GenealogieOnline Trees Index, 1000-Current about Margaret Verch Llewellyn. Source Information: Ancestry.com. Web: Netherlands, GenealogieOnline Trees Index, 1000-Current [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014. Original data: GenealogieOnline. Coret Genealogie, (Accessed 25 December 2014.). Broken links, data not sourced, inaccurate. Do not use this for a source for Margaret of Wales.
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MEDIEVAL LANDS: A prosopography of medieval European noble and royal families by Charles Cawley © Foundation for Medieval Genealogy & Charles Cawley 2000-2017.