He was a canon of Krakow educated at Jagiellonian University in Krakow. Casimir IV Jagiello sent him on diplomatic mission to the papal and the imperial court for important political business. He was involved in negotiations with the Teutonic Knights and king Casimir IV during the Thirteen Years' War (1454-66) and at the peace negotiations.
Longinus did not take the offered position to the archbishopric Prague, but shortly before his death he was elected archbishop of Lemberg or Lwow.
His works :