WILLIAMSTADT, a sea-port town of Holland. It is a handsome strong place, and the harbour is well frequented. It was built by William prince of Orange in 1585; and in 1732 belonged to the stadtholder of Friesland. The river near which it is built is called Butterfliet, or Holland Diep; and is one of the bulwarks of the Dutch on the side of Brabant, where they always keep a garrison. E. Long. 4. 23. N. Lat. 51. 41.