For ten points, name this artist, famous for woodcuts like Knight, Death, and the Devil, and Four Horsemen of the Apocalypse.
Though he completed etchings including Abduction of Proserpina on a Unicorn and Agony in the Garden during his period of maturity, he was better known for a form he learned while serving as an apprentice under Michael Wolgemut.  Among his work in that form is a 1515 work derived from written description and brief sketch of a rhinoceros, and a depiction of an angel in sad thought with a magic square in the background, Melancholia I.  For ten points, name this artist, famous for woodcuts like Knight, Death, and the Devil, and Four Horsemen of the Apocalypse.
Though he completed etchings including Abduction of Proserpina on a Unicorn and Agony in the Garden during his period of maturity, he was better known for a form he learned while serving as an apprentice under Michael Wolgemut.  
Albrecht D?rer