sentences:  It is alleged Fergus, First Lord of Galloway (1138), granted then St. Maria de Trayl, (St. Mary's Isle) to the Monks of Holyrood Abbey, (The Abbot of Sancte Crusis) as confirmed by John, Bishop of Galloway, at the beginning of the thirteenth century.Fergus, having his principal seat on Palace Isle, Loch Fergus, erected the ‘Prioratus Sanctae Mariae de Trayl’ (St. Mary's Isle Priory) in penitence for rebellion against King David I of Scotland.Whether or not the endowment was made for this purpose, Holyrood Abbey established a daughter house there which is on record by the time of a grant by Lochlann, Lord of Galloway sometime between 1189 and 1193.