At this “round rock,” a noted Indian landmark, the original purchase of this land was made from Quassaquanch, Kachanaquant, and Quequaquenuet, chief Sachems of the Narragansetts, by Samuel Wilbor, John Hull, John Porter, Samuel Wilson, and Thomas Mumford, January 20, 1657-8. Here at Treaty Rock Roger Williams and William Coddington probably completed purchase of Providence and Aquidneck, March 24, 1637-8, and the Atherton Company in 1662 foreclosed its mortgage on the Narragansett lands.