Career
Leysen originated from a well-known family, recognized in colonizing southern Warmia within the State of the Teutonic Order. His father Gerico inherited the position of Schultheiß from his father. On 13 October 1353, Leysen received a settlement privilege from the Bishopric of Warmia.
In 1372 he was promoted to the German nobility, adding the preposition von.