Donncuan O'Toole

Donncuan was born in 1005.  Donncuan's father was Ua Tuathail Prince of Leinster.  His paternal grandfather was Donn Cuan "The Simpleton King" of Leinster.  He was an only child.  He died at the age of 54 in 1059.

They had a son named Gilla Comgaill.