The location is currently not certain, although it is thought to be on the site of the present Sligo Town Hall on Quay Street.
[3] After the arrival of the justiciar (representative) of the King of England, Maurice Fitzgerald land was granted to the clergyman Clarus MacMailenn of Lough Cé intended for the construction of a hospital.
Fedlim O'Conchobar, King of Connacht was ordered to build a castle by Maurice Fitzgerald, the Norman baron and warrior.
(Annals of Connacht, 1245) On 9 December 1294, after the forces of Richard de Burgh, Earl of Ulster, destroyed Sligo castle, John fitz Thomas captured the earl, and imprisoned him in Lea castle for three months until he relinquished all authority over fitz Thomas in Connacht.
Fitz Thomas was summoned before King Edward I the following July and allowed to return home only after agreeing to strict conditions of behavior.