Wenzel Hollar was a Bohemian (Czech) artist who fled his country in the Thirty Years War, settling mostly in England (he was besieged at Basing House in the English Civil War, and then followed his Royalist patron into a new exile in Antwerp, where he worked with a number of the large publishers there). He produced great numbers of etchings in a straightforward realist style, many topographical, including large aerial views, portraits, and others showing costumes, occupations and pastimes. Stefano della Bella was something of an Italian counterpart to Callot, producing many very detailed small etchings, but also larger and freer works, closer to the Italian drawing tradition. Anthony van Dyck produced only a large series of portrait prints of contemporary notables, the "Iconographia" for which he only etched a few of the heads himself, but in a brilliant style, that had great influence on 19th century etching. Ludwig von Siegen was a German soldier and courtier, who invented the technique of mezzotint, which in the hands of better artists than he was to become an important, mostly reproductive, technique in the 18th century.