The 13th century History of Gruffydd ap Cynan records that the "grandmother...his mother´s mother" of King Gruffydd was "Mailcorcre daughter of Dunlang son of Tuathal King of Leinster". 1
Also called Máelcorcre Ó Toole.
Marriage Information:
Máelcorcre married Amlaíb mac Sitric, rí Gall, Sitric mac Amlaíb and Slani ingen Briain Dál G'Cais of Munster, before 1031. (Amlaíb mac Sitric was born about 1013 and died in 1034.)
Sources
1 Foundation for Medieval Genealogy, Medlands: Mailcorcre.