[Didymus] (twin), a surname of St. Thomas; also the name of a grammarian of Alexandria, a contemporary of Cicero, and who wrote commentaries on Homer.

[Diebitsch, Count], a Russian general, born in Silesia; commander-in-chief in 1829 of the Russian army against Turkey, over the forces of which he gained a victory in the Balkans; commissioned to suppress a Polish insurrection, he was baffled in his efforts, and fell a victim to cholera in 1831.

[Dieffenbach, Johann Friedrich], an eminent German surgeon, born at Königsberg; studied for the Church; took part in the war of liberation, and began the study of medicine after the fall of Napoleon; was appointed to the chair of Surgery in Berlin; his fame rests on his skill as an operator (1792-1847).

[Dieffenbach, Lorenz], a distinguished philologist and ethnologist, born at Ostheim, in the grand-duchy of Hesse; was for 11 years a pastor; in the end, until his death, librarian at Frankfort-on-the-Main; his literary works were numerous and varied; his chief were on philological and ethnological subjects, and are monuments of learning (1806-1883).

[Diego Suarez, Bay of], is situated on the NE. of Madagascar, and has been ceded to France.

[Diemen, Antony van], governor of the Dutch possessions in India, born in Holland; was a zealous coloniser; at his instance Abel Tasman was sent to explore the South Seas, when he discovered the island which he named after him Van Diemen's Land, now Tasmania after the discoverer (1593-1645).

[Diepenbeck, Abraham van], a Flemish painter and engraver (1599-1675).

[Dieppe] (22), a French seaport on the English Channel, at the mouth of the river Arques, 93 m. NW. of Paris; a watering and bathing place, with fisheries and a good foreign trade.

[Dies Irae] (lit. the Day of Wrath), a Latin hymn on the Last Judgment, so called from first words, and based on Zeph. i. 14-18; it is ascribed to a monk of the name of Thomas de Celano, who died in 1255, and there are several translations of it in English, besides a paraphrastic rendering in the "Lay of the Last Minstrel" by Scott, and it is also the subject of a number of musical compositions.

[Diet], a convention of the princes, dignitaries, and delegates of the German empire, for legislative or administrative purposes, of which the most important in a historical point of view are diets held at Augsburg in 1518, at Worms in 1521, at Nüremberg in 1523, 1524, at Spires in 1526, 1529, at Augsburg in 1530, at Cologne in 1530, at Worms in 1536, at Frankfort in 1539, at Ratisbon in 1541, at Spires in 1544, at Augsburg in 1547, 1548, 1550, and at Ratisbon in 1622.