For the next two years, de Wet worked in his Canongate studio painting a portrait a week for the royal collection. An earlier series of Scottish royal portraits, painted by George Jamesone for Charles I's Scottish coronation in 1633 and of which 26 currently survive, were sent to Holyrood and used by de Wet as a source for his own portraits. The inscriptions of names and accession dates follow George Buchanan's list of Scottish kings, however the dates are considerably muddled, either by a later restorer or the artist himself. The completed set (a portrait of James VII was also added upon his accession) was hung in the Great Gallery of Holyroodhouse and 97 are still on display today. Eleven of the portraits have disappeared, possibly destroyed by Lieutenant General Henry Hawley’s Dragoons, who were stationed at Holyrood after their defeat by Bonnie Prince Charlie at Falkirk in 1746.