Green Island was called by the Native Americans "Pachanhanit" or "Nehanenesick", and was owned by the natives Amenhanit, Aepjen, and Wanapet until they sold it in 1665. The island was part of the Manor of Rensselaerswyck begun by the Patroon Kiliaen van Rensselaer, whose great-grandson (Colonel Kiliaen van Rensselaer) sold the island in 1708 to Colonel Pieter Schuyler. The island was sold a few years later in 1714 to Hendrick Oothout. In 1796 the northern part of the island was purchased by George Tibbits, after whom the island received its name of Tibbits Island; while the southern portion of the island was sold by the Oothout family in 1833 to Daniel Cady. The next year Cady sold the land to the Tibbits family.