William De Burgh
William was born about 1160 in Connacht, Ireland.  He died in 1205.

 Mor O'Brien
Mor was born about 1165.

 Richard 'The Great' De Burgh
Richard 'The Great' was born about 1195 in Galway, Ireland.  He died about 1242.

 Richard 'The Younger' De Burgh
Richard 'The Younger' was born in 1207.