It is inferred from stylistic analysis that Coques likely worked for van Dyck. The first period of collaboration probably took place between 1629 and 1632, i.e. after van Dyck's return to Flanders and his departure for England. The second period was during the years 1634-1635 when van Dyck was back in Antwerp. Coques' intimate knowledge of some of van Dyck's later English compositions points to a possible stay of Coques in England during van Dyck's final residence in England. This would also explain why Joannes Meyssens' engraved portrait mentions that Coques had worked for Charles I of England. He also worked for Charles I's two sons, Henry Stuart, Duke of Gloucester and Charles II during their exile in Bruges in the years 1656-1657.