Around 1049 Robert Mortain Count Mortain, 1st Earl Cornwall (18) was appointed as Count Mortain (Mortagne)
On 14 Oct 1066 the Norman army led by William "Conqueror" I King England (38) defeated the English army of Harold II King England (44) at the Battle of Hastings fought at Senlac Hill. Aimery Thouars, Ralph de Gael Gael Earl East Anglia, Eustace Flanders II Count Boulogne, William Fitzosbern 1st Earl Hereford, Geoffrey Châteaudun II Count Mortain, III Count Perche, William Warenne 1st Earl Surrey, Raoul Tosny, Robert Beaumont-Roger 1st Earl Leicester, Count Meulan (26) , Hugh Grandesmil (34) , Roger "The Great" Montgomery 1st Earl Shrewsbury (possibly), Robert Mortain Count Mortain, 1st Earl Cornwall (35) and Odo Mortain Bishop Bayeux, Earl Kent fought for William. Engenulphe Aigle (56) was killed. The brothers Harold II King England (44) , Gyrth Godwinson Earl East Anglia (34) and Leofwine Godwinson 2nd Earl Kent (31) .
In 1072 Robert Mortain Count Mortain, 1st Earl Cornwall (41) was created 1st Earl Cornwall (2C 1072)
In 1090 Robert Mortain Count Mortain, 1st Earl Cornwall (59) died
Father: Herluin de Conteville Mortain
Mother: Herleva Unknown