Documentation of Miwok peoples dates back as early as 1579 by a priest on a ship under the command of Sir Francis Drake. Other verification of occupancy exists from Spanish and Russian voyagers between 1595 and 1808. Over 1000 prehistoric charmstones and numerous arrowheads have been unearthed at Tolay Lake in Southern Sonoma County - some dating back 4000 years. The lake was thought to be a sacred site and ceremonial gathering and healing place for the Miwok and others in the region.