Ptolemy's placement of the Selgovaean town of Trimontium was accepted to be somewhere along the southern coast of Scotland until William Roy (1726–1790) placed it far to the east at Eildon Hills, near Newstead. Roy was trying to follow an itinerary given in the 1757 "De Situ Britanniae", and moving Ptolemy's Trimontium made the itinerary seem more logical according to his historical work, "Military Antiquities of the Romans in North Britain" (1790, published posthumously in 1793). Roy did not alter Ptolemy's placement of the Selgovae in southern Scotland, but chose to assign Trimontium to a different people who were described in "De Situ Britanniae".