Siegmund, a distinguished Dutch scholar, was born at Utrecht in 1683. He succeeded Gronovius as professor of Greek at Leyden, and held at the same time the chairs of rhetoric and history. He was undoubtedly a learned man and a laborious scholar, but his works, which were written for the most part hastily and carelessly, are now forgotten. The most important of them are his—

Editions of the Apologetica of Tertullian, 1718, in 8vo; of Lucretius, 1725, in 2 vols. 4to; of the History of Josephus, 1726, in 2 vols. folio; of Eutropius, 1729, in 8vo; of Orosius, 1738, in 4to; of Quintus, 1742, in 2 vols. 4to; and, lastly, of Censorinus, 1743, in 8vo; Dissertations de Alexandri Magni numinante quo quater summae habet terrarum imperia continerentur, et de nummis contortoribus, Leyden, 1729, in 4to; Thesaurus Tertullianus, Amsterdam, in 2 vols. folio; Universal History, explained in Latin, in Dutch, Leyden, 1739, in 5 vols. folio, incomplete; Bibliotheca Scriptorum qui de Lingua Graeca vera et recta pronunciariuntur Commentaria reliquiorum, Leyden, 1738-1740, in 2 vols. 8vo; Introductio in historiam patriae a priscis Hollandiae comitibus usque ad pacem Ultrictae, et Radstad (1714), Leyden, 1739, in 8vo; Introductio in Antiquitates Romanas, ibid., 1740, in 8vo; Museum Willemseum in duae partes divisum, Amsterdam, 1740, in 8vo; Museum Vitebrochianum, ibid., 1741, in 8vo; Bronze Medals, large and small, in the Cabinet of Queen Christina, Hague, 1742, in folio.