The first part of the Scotichronicon, a chronicle of the Scots, was written c.1385 by John of Fordun, an Aberdeen priest, who was probably originally from Fordoun, halfway between Dundee and Aberdeen. Walter Bower or Bowmaker, abbot of Inchcolm in the Firth of Forth, continued Fordun's unfinished work c.1445. This copy of the text is known as the Black Book of Paisley because it was written at Paisley, to the west of Glasgow. In the Middle Ages there were many ways of expressing dates, one of which was by reference to the papacy: a list of popes and the lengths of their reigns is therefore not uncommon in manuscripts dealing with chronology and chronicles. The list of popes begins with Beatus Petrus (St. Peter) and concludes on the following page with Nicholas V (1447-1455). In the upper margin is an ownership inscription of the convent of Paisley.