Earl Colbán of Buchan died after 1178 (<em>RRS</em> ii, nos. 197, 205) and Fergus was earl by the early 1190s (<em>RRS</em> ii, nos. 300, 344). <em>Terminus ante quem</em> provided by accession of Earl William Comyn between 9 Oct. 1211 and 17 Aug. 1214