HASDEU or HAJDEU, BOGDAN PETRICEICU (1836-1907), Rumanian philologist, was born at Khotin, Bessa rabia, and studied at the University of Kharkov. In 1858 he first settled in Jassy as professor of the high school and librarian. He may be considered as the pioneer in many branches of Rumanian philology and history. At Jassy he started his Archiva historica a Romaniei (1865-67), in which a large number of old documents in Slavonic and Rumanian were published for the first time. In 187o he inaugurated Columna lui Trojan, the best philological review of the time in Rumania. In his Cuvente den Butrdni (2 vols., 1878 81) he was the first to contribute to the history of apocryphal literature in Rumania. His Historia critica a Romanilor though incomplete, marks the beginning of critical investigation into the history of Rumania. Hasdeu edited the ancient Psalter of Coresi of 1577 (Psaltirea lui Coresi, 1881). In 1876 he was appointed director of the State archives in Bucharest and in 1878 professor of philology at the University of Bucharest. His works include one drama, Rasvan si Vidra. After the death of his only child Julia in 1888 he became a mystic and a strong believer in spiritualism. He died at Campina on Sept. 7, 1907. (M. G.)