Founding and formation
When part of the New Netherland colony, Dutch traders first called the area of present-day Ulster County "Esopus", a name borrowed for convenience from a locality on the opposite side of the Hudson. The local Lenape indigenous people called themselves Waranawanka, but soon came to be known to the Dutch as the "Esopus Indians" because they were encountered around the settlement known as Esopus. In 1652, Thomas Chambers, a freeholder from the Manor of Rensselaerswyck, purchased land at Esopus. He and several others actually settled and began farming by June, 1653. The settlements grew into the village of Wiltwijck, which the English later named Kingston. In 1683, the Duke of York created 12 counties in his province, one of which was Ulster County. Its boundaries at that time included the present Sullivan County and parts of the present Delaware, Orange, and Greene Counties.
In 1777, the first state capital of the independent New York State was established at Kingston. The official records of Ulster County were removed to safety to a stone house in Kerhonkson when it became evident that the British would burn Kingston.