Sabh Kavanagh
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About
Sabh Kavanagh was a daughter of Donal Reagh Kavanagh MacMurrough, King of Leinster, and married Sir James Butler of Polestown. She is described in the sources as a princess of Leinster, and through her the MacMurrough line enters this family for the third separate time.
Research notes
✓ DOCUMENTED (Wikipedia 'Piers Butler, 8th Earl of Ormond' (citing Cokayne Complete Peerage VI, Lodge, DIB, Dunboyne Butler Family History); read 23 Jul 2026.): SABH (Sadhbh/Sabina) KAVANAGH, 'a princess of Leinster', eldest dau. of DONAL REAGH KAVANAGH MacMURROUGH (1396-1476), KING OF LEINSTER; wife of Sir James Butler of Polestown; mother of Piers 8th Earl (our line). *** A SECOND ROYAL DESCENT via Helen Butler: the KAVANAGH / MacMURROUGH KINGS OF LEINSTER - the same Uí Cheinnselaig royal house as DIARMAIT MacMURCHADA (d.1171, already Aynsley's ancestor via Aoife & Orlacan); the Kavanaghs descend from Diarmait's son Domhnall Kavanagh, so this line loops back toward Diarmait (extendable via the MacMurrough/Kavanagh pedigree). Direct ancestress. Added 23 Jul 2026.