Salme Mälardalsson VK555, I-Y3657,

All Vikings (Branch with Pink colored background, id VKxxx) belong to the Haplogroup I-Z73 and downstream.
(Upstream, from Z73 to DF29 there are another 4 Vikings)

https://www.yfull.com/tree/I-Z73/

and Graves from Google Maps:
https://www.google.com/maps/d/edit?mid=1NMWaZLy8G42dEIpHW5EeY1rEIm9...

Generally:
The names Salme Mälardalsson Tolvman, Olafur Tommeidetson Tolvman, Edward Oxfordson Tolvman, serve as collective names for the Vikings who were buried in ship graves, in Salme on Saaremaa in Estonia in 750 AD, according to archaeological investigations and DNA tests.
They came from the Mälardalen in Sweden and were of higher status. They were buried in their ship.
And a Viking VK524 in a ship grave in Tommeidet, Nordland Norway, VK420 in ship grave in Hedmark Norway as well as a number of Vikings in a mass grave in Oxford, England. All this is verified by scientific reports linked below.
About the Salme II ship grave in Saare County Estonia:

https://en.m.wikipedia.org/wiki/Salme_ships

https://en.m.wikipedia.org/wiki/List_of_legendary_kings_of_Sweden

There are Y-DNA matches, in direct paternal line, between
all people that are downstream from I-Z73 and all subclades, with the Vikings VK492, VK555, VK491, VK497,VK483, and VK552, who were buried in this ship grave.

https://www.yfull.com/tree/I-Z73/

A close relative of VK555, is VK379 from a shipgrave at Nabbelund, Öland,Sweden, see below, where both have the same mtDNA U3b1b1c, suggesting close kinship.

VK379 came from Västmanland, Mälardalen, Sweden according to YFull's data, see I-FGC22046, which confirms the archaeological investigations that suggest that the Salme Vikings came from Mälardalen.

https://www.yfull.com/tree/I-FGC22046/
(id:YF010703SWE [SE-U] = From Västmanland Sweden)

VK379 data
Sample: VK379 / Oland_1077
Location: Oland, Sweden
Age: Early Viking 700 CE
Y DNA: I-FGC22048
mtDNA: U3b1b1c

VK555 data
Sample: VK555 / Estonia_Salme_II-I
Location: Salme, Saaremaa, Estonia
Age: Early Viking 8th century CE
Y DNA: I-Z73
mtDNA: U3b1b1c

https://www.yfull.com/mtree/U3b1b1c/

About the massacre in Oxford, England
There are also a lot of DNA matches.
A Viking VK163 (same mtDNA as I-FT369548; U2e2a1a1) and VK146, in a mass grave in Oxford England,

https://www.bbc.com/news/science-environment-14476039

Sample: VK163 / UK_Oxford_#1
Location: St_John’s_College_Oxford, Oxford, England, UK
Age: Viking 880-1000 CE
Y-DNA: I-M253
mtDNA: U2e2a1a1

Sample: VK146 / UK_Oxford_#10
Location: St_John’s_College_Oxford, Oxford, England, UK
Age: Viking 880-1000 CE
Y-DNA: I-M6155 (I-Y3000)
mtDNA: J1c3e1

DNA match on Viking VK524 and VK519 (same mtDNA HV0a1c, close kinship) In Nordland Norway and VK420 in Hedmark Norway
The Norwegian Ship Graves:

https://www.yfull.com/mtree/HV0a1c/

Sample: VK519 / Norway_Nordland 4691b
Location: Nordland, Nor_North, Norway
Age: Viking 6-10th centuries CE
Y-DNA: I-M253
mtDNA: HV0a1c

Sample: VK524 / Norway_Nordland 3708
Location: Nordland, Nor_North, Norway
Age: Viking 10th century CE
Y-DNA: I-M6155 (I-Y3000)
mtDNA: HV0a1c

Sample: VK420 / Norway_Hedmark 2813
Location: Hedmark, Nor_South, Norway
Age: Viking 8-11th centuries CE
Y-DNA: I-FGC15560
FTDNA Comment: Shares 8 SNPs with an American man. Forms a new branch down of I-BY158446. New branch = I-FT118954
mtDNA: I4a

See also research reports, links:

https://www.biorxiv.org/content/10.1101/703405v1.full

https://www.cambridge.org/core/journals/antiquity/article/isotopic-...

https://dna-explained.com/2020/09/18/442-ancient-viking-skeletons-h...

And a file at sources from Natureresearch:
41586_2020_2688_MOESM1_ESM-2