Meanwhile, the second overland party, headed by Portolá, gathered in Loreto, around 900 miles south of San Diego — with instructions to follow the Rivera party to San Diego. The Portolá expedition included Franciscan missionaries headed by Junípero Serra. The expedition founded the Mission San Diego de Alcalá and the Royal Presidio of San Diego in July 1769 at San Diego. Portolá then continued north to explore the Alta California coast and re-establish the port of Monterey visited in 1602 by Sebastián Vizcaíno.