William Croyser of St. Andrews;
Unversity of St Andrews Elwald & Croyser for Pope Martin V;
John Elwald rector of St Andrews University 1418, the provost was Bothwell (surname Douglas).
William Croyser, Archdeacon of Treviotdale, is spelled correctly in 1400 as Croyser.
When Robert Elwald of Redheugh received the lands of Redheugh, Lariston, Hartsgarth and others, the names Ninian Elwald, and Andrew Elwald appear, likely influenced by John Elwald rector of St Andrews University 1418, and rector of Kirkandrews (church of St Andrews near Canonbie).