John Closterman (also spelt Cloosterman, Klosterman; 1660 – 24 May 1711 (buried)) was a Westphalian portrait painter of the late 17th and early 18th centuries.
Born in Osnabrück in the Holy Roman Empire (now in Lower Saxony), Closterman was the son of an artist who taught him the rudiments of design.
[3] Jacob Campo Weyerman, who took much of his biographical material from Houbraken, states "Closterman had taken a beautiful mistress who, while he was away in the country, robbed him of his valuables and disappeared, actions which drove the painter into madness".
[2] In 1702, Closterman painted a whole-length portrait of Anne, Queen of Great Britain in her coronation robes, wearing a crown, and carrying the orb and sceptre.
Closterman supposedly had so many disputes with Sarah Churchill that her husband remarked, "It has given me more trouble to reconcile my wife and you than to fight a battle".