Fergus Colban "4th Earl of Buchan"
Fergus of Buchan was the last native Gaelic Mormaer of Buchan, and only the third to be known by name as Mormaer.
(In early medieval Scotland, a mormaer was the Gaelic name for a regional or provincial ruler, theoretically second only to the King of Scots, and the senior of a Taoiseach (chieftain). Mormaers were equivalent to English earls or Continental counts, and the term is often translated into English as 'Earl'.)
Fergus appears to have had strong connections in Fife.
A charter issued by Fergus appears to have survived, this charter is a feudal charter granting lands to a subordinate.
The charter had a few witnesses with French names, presumably a phenomenon related to his Comyn connections.
Fergus had no male heirs, and married his only daughter Marjory to William Comyn, bringing Gaelic control of the Mormaership to an end.
On Fergus' death, Buchan became the first native mormaerdom to pass into the hands of a foreign family
Countess Marjory succeeded her father before 1211, as between that date and 1214 King William the Lion confirmed a grant by her of the church of Tariff to the abbey of Aberbrothoc.
Countess Marjory had a manor near Leuchars in Fife.
He died sometime before 1214, possibly much earlier.