Alexander Cooper ( 1605 - 1660 ) was a British painter. Alexander Cooper s works have been auctioned off multiple times, with realized prices varying according to the size and medium of the artwork, for instance of 1093.95 USD for William VI 'the Constant' (1629-1663), Landgrave of Hesse-Cassel 1637-1663, in gold-embroidered brown doublet with wide lawn col in 2005