Career
Although he was not technically a papal nuncio, in 1459 Landus became one of the first papal delegates to Poland. Landus hoped to garner support from Casimir IV against the Ottomans who had captured Constantinople in 1453. Nevertheless, the Holy See continued to send papal legates, and the first permanent Apostolic Nuncio in Poland was Bishop Luigi Lippomano, appointed in 1555 by Pope Julius III and sent to the Polish by Pope Paul IV. Landus was titular Latin Patriarch of Constantinople from 1474-c.1496.