\'Johannes Longinus' (Jan Dlugosz) (1415-1480) was a Polish historian (a chronicler) and a secretary of Bishop Zbigniew Olesnicki of Krakow.
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.
His works :
- Liber beneficiorum ecclesiae Craceviensis ("Book of the Benefices of the Bishopric of Krakow")
- Historiae Polonicae libri xii originally appeared in 12 books between 1455 and 1480 but was not published in full until 1711-12 (2 vol.)