In March 1775, land speculator and North Carolina judge Richard Henderson met with more than 1,200 Cherokees at Sycamore Shoals. Included at the gathering were Cherokee leaders such as Attacullaculla, Oconostota, and Dragging Canoe. The meeting resulted in the "Treaty of Sycamore Shoals", in which Henderson purchased from the Cherokee all the land situated south of the Ohio River and lying between the Cumberland River, the Cumberland Mountains, and the Kentucky River. This land, which encompassed roughly 20 million acres (80,000 km²), became known as the Transylvania Purchase. Henderson's land deal was found to be in violation of North Carolina and Virginia law, as well as the Royal Proclamation of 1763, which had prohibited the private purchase of American Indian land.