Fast Castle is a ruined 15th century tower standing on a precipitous promontory.

In 1497 Cuthbert Home, son of Sir Patrick Home of Fast Castle, married Elizabeth Martin of Medhope, the heiress of Midhope, married. Cuthbert died at the Battle of Flodden in 1513.

Elizabeth Martyne, Lady of Falscastell, granted half the lands of Medop, half the lands of Mannerstoun and half the mill of Abercorne to Sir James Hamilton of Finnart in 1537. George Hamilton seems to have acted as a bailiff for Lady Fast Castle.