Olompali State Historic Park preserves the former Rancho Olompali, a seven hundred-acre site whose history spans from an early Coast Miwok village to modern California. Occupied from about 500 CE and a major native center by around 1200, it has yielded important Miwok artifacts and evidence of possible early contact with Pacific exploration. In 1776, Aurelio of the Olompolli band built an adobe house there, later associated with his son Camilo Ynitia, who received Rancho Olompali in 1843 and uniquely retained a large Mexican-era Native land grant after U.S. control. The site also saw the Battle of Olompali in 1846, later became an estate, retreat, counterculture gathering place, and finally a state park in 1977.