Euanthia

Wife from husband's wikis & mother by children's wikis of:

• Pandulf I "Ironhead", prince of Benevento Capua & Salerno
• Landulf III-V, prince of Capua

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-http://fmg.ac/Projects/MedLands/SOUTHERN%20ITALY,%20PRE-NORMAN.htm#...

 A second possibility is that she was 

EUANTHIA, daughter of ---. The Chronicon Comitum Capuæ names "Landulph et Yvantie ucsore sue" when referring to a donation[1584], which appears to refer to Prince Landolf IV. Stasser points out that this source is a late, spurious compilation[1585]. No indication has been found of any earlier sources on which this forgery may have been based, but the name is presumably Byzantine as it recalls "Euanthia" wife of Grimoald III Prince of Benevento (who died in 806).

  Prince Landolf IV & his wife had [six] children: …

[1584] Chronicon Comitum Capuæ, MHG SS III, p. 209.
[1585] Stasser (2008), p. 364, citing Cilento, N. (1971) Italia meridionale longobarda (Milan, Naples), p. 287, note 34.

https://genealogics.org/getperson.php?personID=I00546034&tree=LEO

 BIOGRAPHY

Gianni II, called 'the Accursed' (Maledictus), was the son of Lamberto of Spoleto. He was the count of the palace of Salerno in 980 and acting regent for Pandolfo II of Salerno, a son of Pandolfo I 'the Iron-Head', principe di Capua e Benevento, duca di Spoleto. He was pushed out with Pandolfo II by Manso I, duke of Amalfi, in 981. The rule of Manso and his son Gianni I was oppressive and the local populace rose in revolt and elected the Spoletan Gianni II prince in 983, expelling Manso.
Gianni married Sigelgaita di Benevento, daughter of Landolfo II, principe di Benevento e Capua, and his wife Wanzia, and sister of Pandolfo I 'the Iron-Head'. Their son Guaimar III would have progeny.

References

• http://fmg.ac/Projects/MedLands/SOUTHERN%20ITALY,%20PRE-NORMAN.htm#...
• https://www.our-royal-titled-noble-and-commoner-ancestors.com/p343....
• https://genealogics.org/getperson.php?personID=I00546032&tree=LEO