*Dearbhforghaill (Devorgilla) O'Brian (of Leinster?)
born Abt 1000 Ireland
died 1080

father:
*Morough (Murchad) O'Brien King of Leinster
born Abt 0975 Of Ireland
or
*Donnchad MacBrien
born 0981
died 1064
buried San Stefano Rotunda Church, Rome, Italy

mother:
unknown

siblings:
unknown

spouse:
*Diarmait MacMáil na mBó King of Ireland
born 0974
died 7 February 1071/72

children:
*Murchadh (Murrough) King of Leinster
born about 1025 Ireland
died 1090

biographical and/or anecdotal:

notes or source:
LDS

ancestry.com
Donnchad & Murchad (the possible fathers) were half-brothers.