Andreas Vesalius (1514-1564).

For some reason Jacob Sylvius, crossed with him and remained his enemy till the end. Vesalius was professor of anatomy at Padua for some time. Sylvius had condemned his former student as a "madman whose pestilential teachings were poisoning Europe". When he was discredited, even by his other colleagues and students, he left Padua, at the age of 30, never to return again. He accepted an invitation to the Spanish court in 1559, where he became physician at the court of Phillip-ll.