Heinrich Cornelius Agrippa von Nettesheim lived between 1486-1535. He appears on a Chocolate Frog trading card, which reads "celebrated wizard imprisoned by Muggles for his writing, because they thought his books were evil". Ron missed his card in his collection.
In the Muggle version of history, Agrippa was a German soldier and physician, and an adept in alchemy, astrology, and magic. In his book De Occulta Philosophia (1531), Agrippa encouraged the study of magic, explaining the world in terms of cabalistic analyses of Hebrew letters and Pythagorean numerology; he believed that magic was the best means to know God and nature.