HOLSTENIUS, LUCAS, the Latinized name of Luc Holste (1596-1661), German humanist, geographer and theological writer, was born at Hamburg. He studied at Leyden university, where he became intimate with the most famous scholars of the age-J. Meursius, D. Heinsius and P. Cluverius, whom he accom panied on travels in Italy and Sicily. Eventually he went to Paris, and was recommended to Cardinal Francesco Barberini, papal nuncio and the possessor of the most important private library in Rome. On the cardinal's return in 1627 he took Holsten ius with him as his librarian. He was appointed librarian of the Vatican by Innocent X., and was sent to Innsbruck by Alexander VII. to receive Queen Christina's abjuration of Protestantism. He died in Rome on Feb. 2, 1661. Holstenius was a man of unwearied industry and immense learning, but he lacked the persistency to carry out the vast literary schemes he had planned. He was the author of notes on Cluvier's Italia antiqua (1624) ; an edition of portions of Porphyrius (163o) ; notes on Eusebius Against Hier ocles (1628), on the Sayings of the later Pythagoreans (1638), and the De diis et mundo of the neo-Platonist Sallustius (1638) ; Notae et castigationes in Stephani Byzantini ethnica (first pub lished in 1684) ; and Codex regularum, Collection of the Early Rules of the Monastic Orders (1661) . His correspondence (Epis tolae ad diversos, ed. J. F. Boissonade, 1817) is a valuable source of information on the literary history of his time.