Mission San Francisco Solano de Sonoma Founded in July 4,1823. Named for Saint Francis Solanus of Montilla, Spain (the violinist and the patron saint of Bolivia, Peru, Paraguay, Uruguay, Chile, and Argentina). This mission is the 21st in the 21 Alta California chain of missions and the most northerly in the chain. Located in the town of Sonoma . Founded by Father Jose Altimira and twenty soldiers. This Mission served as a Spanish outpost against the Russians.