 The English Earl of Northumberland was also held here , after fleeing to Scotland following the failure of the Catholic Rising of the North in 1570 . He was captured by the Earl of Morton , and confined at Loch Leven before being sent back to England for execution . In 1588 , Sir William Douglas of Lochleven succeeded to the earldom of Morton , as the 6th earl . With the title he inherited other properties , including Aberdour Castle in Fife , and Loch Leven Castle became less frequently used . 
