Donnchadh IV, Earl of Fife [Duncan IV] (1289–1353) was sometime Guardian of Scotland, and ruled Fife until his death. He was the last of the native Scottish rulers of that province. He was born in late 1289, the same year as his father Donnchadh III's murder. He therefore came into the Mormaerdom as a baby. He was so young that the honour of crowning John Balliol – normally the hereditary right of the Mormaer of Fife – was delegated to a knight, namely . He also missed the crowning of Robert the Bruce, owing to his captivity in England. Robert was forced to call upon Donnchadh's sister, Isabella, to officiate in his absence.