Anthony van Dyck was a commercially successful painter in Antwerp and Italy, but he may have had the most influence in England when he served as court painter to King Charles I.
Research:

Behind the Scenes Minis: Piece of Work
17:48

E. Virgil Neal: Hypnotist, Fraudster, Tycoon, Part 2
41:22

E. Virgil Neal: Hypnotist, Fraudster, Tycoon - Part 1
35:28