Earl of Fife - Chief (ceann) of Clann Meic Duib

Chief (ceann) of Clann Meic Duib

The deputy or complementary position to mormaer or earl of Fife was leadership of Clan MacDuff (clann meic Duibh). There is little doubt that the style MacDuib, or Macduff, derives from the name of King Cináed III mac Duib, and ultimately from this man's father, King Dub (d. 966). Compare, for instance, that Domhnall, Lord of the Isles, signed a charter in 1408 as MacDomhnaill. The descendants of Cináed III adopted the name in the same way that the descendants of Brian Bóruma mac Cennétig called themselves Uí Briain, although it does seem that at least initially MacDuff was a style reserved for the man who held the Mormaership of Fife.

The chieftaincy of the clan was not always held by the mormaer, especially after the mormaerdom became subject to the laws of feudal primogeniture in the reign of Donnchadh I. For example, at the Battle of Falkirk, it is the head of the clan who led the men of Fife, rather than the Mormaer.