Aertgen van Leyden (also Aertgen Claesz.), Netherlandish painter, draughtsman, and designer of stained glass. Some sources incorrectly name him as a brother of the more famous Lucas van Leyden. Little is known about him, and few works can be securely associated with him. In 1516 he was a pupil of Cornelis Engebrechtsz and he worked in Leiden until his death in 1564. The biographer Karel van Mander describes Aertgen's style as extremely varied, with marked stylistic changes. //