(d. early 7th century),
abbot and founder of the monastery of Deer (Aberdeenshire). This became an important centre for the foundation of churches on both sides of the Moray Firth. Being in a distant part of hostile Pictland, it is most unlikely that it was ever founded, as is sometimes claimed, by Columba. There are several dedications to Drostan in NE. Scotland. Feast: 11 July. The old church at Aberdour claimed his relics, and St Drostan's Well is near by.
AA.SS. Iul. III (1723), 198–200; W. D. Simpson, The Historical St Columba (3rd edn., 1963), pp. 48–53;A. B. Scott, ‘St Drostan’, Trans. Gaelic Soc. Inverness, xxvii (1908–11), 110–25.