For his work in Leuven he used two printer's marks: a large one with a crenellated tower, an angel of vengeance above it and the figures of Justice and Peace embracing before the gates, with the motto Justitia et pax osculate sunt.
[1] To demonstrate his skill to the city magistrates, Velpius printed Libert Houthem's Kakogeitnia seu mala vicina, libellus, vicinos malos velut catalogo recensens (1580).
The first work certainly printed in Mons is Le Renart decouvert (1580), an anonymous satire on William of Orange written by Jean Richardot.
He established his business in a bookshop called "Den gulden Arend" (The Golden Eagle), opposite the Coudenberg palace.
Here he designed a new printer's mark, a two-headed eagle charged with a crucifix, and the motto Sub umbra alarum tuarum protege nos (Protect us in the shadow of your wings).
[7] In 1594 his daughter, Catherine, married Hubert Anthoon, and from 1598 Velpius brought his son-in-law into the business, leaving it for him to run after his death in 1614 or 1615.