YSOART, Sigismond (ee-zo-ar), Flemish author, born in Ypres in 1604: died in Amsterdam in 1652. He was a mariner, made voyages to South America and Cape Horn, and, entering the service of the West Indian company in 1641. was employed for several ?-ears in Guiana, and commanded the fleet that devastated the southern coast of Brazil in 1647. In 1649 he made a chart of the Caribbean sea and the coast of Guiana, and, being promoted in the following year a director of the West Indian company, settled in Amsterdam, where he died. He wrote a narrative of his expedition entitled "Diarum nauticum itineris Bavatorum in Indias Occidentales" (Amsterdam, 1650), and contributed to the second edition of the " Histoire du commencement et des progres de la compagnie des Indes Occidentales des Provinces Unies des Pays Bas, contenant les principaux voyages" (3 vols., Amsterdam, 1655-'6).