a celebrated Dutch Orientalist, was born at Oppyck, in the Netherlands, about 1570. He was professor of Hebrew at Harderwyk until 1627, when he was called to the University of Leyden as professor of Hebrew, and some time after was made professor of theology in that high school. He died in 1648. L'Empereur edited the Commentary of Aben-Ezra and Mos. Alschech on Isaiah 52:13 to Isaiah 53:12, with notes (Leyd. 1633); and the Paraphrase of Joseph ben-Jachja on Daniel, with translation and notes (Amsterd. 1633), also the Mishnic tracts Baba Kama and Middoth (Leyd. 1737, 4to). He wrote himself De Dignitate et Utilitate Linguae Hebraics (1627, 8vo): — Clavis Talinudica, complectens formulas, loca, dialectica et logica priscorume Judaeorum (Leyden, 1634, 4to): — De legg. hebr. forens. (Leyd. 1637, 4to); and Disputationes theologicae (Leyd. 1648, 8vo). See Kitto, Cyclop. Bibl. Lit. s.v.; Hoefer, Nouv. Biog. Gen. 30:642; Fü rst, Bibl. Jud. 1:245 sq.