DLUGOSZ, JAN (JOHANNES LONGINUS) ( I 4 I 5-14801 Polish historian, was the son of the burgrave of Bozeznica. He became the secretary of Bishop (afterwards Cardinal) Zbygniew Olesnicki (1389-1455), and was employed by him on many im portant missions. In spite of his connection with Olesnicki he nevertheless supported King Casimir IV. in his Prussian policy in opposition to his patron. After the Cardinal's death in 1455 he began his Historia polonica (13 vols., ist impression, 1614; st complete impression, 1711). This great book, the first and still one of the best historical works on Poland, was based on an exhaustive study of the archives of Poland and Hungary. It was completed in 1479. Dlugosz became archbishop of Lemberg in 1478. He died on May 19, 148o, at Piatek.
See Semkowicz, Critical Considerations of the Polish Works of Dlugosz (Cracow, 1874) • Michael Bobrzynski and Stanislaw Smolka, Life of Dlugosz and his'Position in Literature (Cracow, 1893) ; both of these are in Polish.