The historical record, such as it is, consists of an entry in the Annals of Tigernach, for the year 501, which states: "Feargus Mor mac Earca cum gente Dal Riada partem Britaniae tenuit, et ibi mortuus est." (Fergus Mór mac Eirc, with the people of Dál Riata, held part of Britain, and he died there.) However, the forms of Fergus, Erc and Dál Riata are later ones, written down long after the 6th century. The record in the Annals has given rise to theories of invasions of Argyll from Ireland, but these are not considered authentic.