Justus, a Roman Catholic, renowned as a scholar in the 16th century, was born near Brussels in 1547. His talent was precocious, and he edited his Variae lectiones at the age of 19. He was secretary to cardinal Granville about this time (1572-74). Later, as professor of history at Jena, lie became a Protestant, and remained such for 13 years while professor of ancient languages at Leyden, but subsequently he returned to the Roman Catholic Church, and was made professor at Louvain (1602). He died March 23, 1606, holding at that time the appointment of historiographer to the king of Spain. His scholarship was honored by the pope and at several European courts. He distinguished himself especially by his commentary upon Tacitus, whose works he could repeat word for word, and by his enthusiastic regard for the stoical philosophy. He wrote De Constantia manuductia ad philosophiam Stoicam: — Physiologiae Stoicorum libri tres (new edit. Antv. 1605, fol.): — also De una religione, etc. His works were collected under the title Opera Omnia (Antv. 1585; 2d edit. 1637). See Wetzer u. Welte, Kirchen-Lexikon, volume 2, s.v.; Theol. Univ. Lex. (Elberf. 1869), volume 1, s.v.