Lion Gardiner (1599–1663) was an English engineer and colonist who founded the first English settlement in New York, acquiring land on eastern Long Island. He had been working in the Netherlands and was hired to construct fortifications on the Connecticut River, for the Connecticut Colony. His legacy includes Gardiners Island, which is held by his descendants.

Poggatacut also known as Youghco or Poggatticut, was sachem of the Manhasset Indian people of Shelter Island, New York and elder brother to Montaukett Sachem Wyandanch. Sachem Poggatacut and his wife Aswaw granted possession to Lion Gardiner for Gardiners Island in 1639. It was conveyed when they deeded Manchonat, an Island between the north and south fork in exchange for goods and alliance. By 1644 he had united the Corchaug, Shinnecock, Manhassets and Montaukett before retreating as Grand Sachem to his redoubt on Shelter Island, relinquishing control over the tribes to his younger brother, sachem Wyandanch. As “Sachem of Paumanacke", as Long Island was called, he was empowered to make treaties for the Montauketts.