IHR 1060708. Bred by John O'Connor, Ireland. Owned by Thomas Cummins, Ireland.
The dam of Flagmount Diamond is the mare Gowan Betty by the Irish Draught stallion New Chieftain. New Chieftain is a son of the stallion Errigal. As King of Diamonds is also a son of Errigal, Flagmount Diamond and his brothers are inbred to Errigal. As well, they are line bred to a great Irish Draught foundation sire, Galty Boy.