Henry Hudson explored what would be known as the
Hudson River for the Dutch in 1609, including
Castle Island which was at the center of
Native American fur trading routes from the interior.
Hendrick Christiaensen chose Castle Island to build Fort Nassau, in 1614 or 1615 as a dual warehouse and military defense structure and named the fort in honor of the
stadtholder of the
United Netherlands, who was of the
House of Orange-Nassau. Nineteenth and early-twentieth century historians claimed that around 1540, French fur traders built a stone "castle" or fortified trading post on Castle Island in the location where Fort Nassau was later built. However, modern scholars have found no evidence to support this claim. Fort Nassau was the first Dutch settlement in
North America. Jacob Eelkens became commander on Christiaensen's death in 1616. In 1624, the Dutch built
Fort Orange about a mile to the north, at current Albany. Castle Island is now part of the
Port of Albany–Rensselaer. ==Geography==