The Irish-Irish author of Lion of Ireland was born before Robert Jordan.
Morgan Llywelyn (born December 3, 1937) is an American-Irish historical fantasy, historical fiction, and historical non-fiction writer. 
James Oliver Rigney Jr. (October 17, 1948  September 16, 2007), better known by his pen name Robert Jordan, was an American author of epic fantasy. 
Lion of Ireland, by the American-Irish author Morgan Llywelyn, is a novel about the life of the Irish hero and High King Brian Boru. 
