Main (Thompson) Library location: South wing -- End window. Martin Flach (c.14-- – 1539) was the son of Strasbourg printer Martin Flach the Elder; it was from him that he learned to print. Following his father's death, Flach began to operate their family printing press and published his first book in 1501, entitled Castigatorium Egidii de Roma. He later established a second press in Strasbourg, from which he shared typesets and printing materials with his stepfather Johann Knobloch for most of his career. Flach printed both humanist and Reformation literature, including many of Martin Luther's Sermones. By his death in 1539, he had printed over one hundred titles. The mark of Martin Flach bears the initials M.F., with a cross extending upward from the F. This simple monogram appeared on most of his fuller devices, usually centered on a heraldic shield presented by a sibyl. Some scholars suspect that Flach based this figure on a portrait of Felicitas Tucher painted by Albrecht Dürer in 1499. In her left hand, the woman supports a large flag onto which Flach has incorporated his own initials with the symbolic crossed staves of Burgundy.