The Gaspar de Portola expedition in 1769 was the first contact by land to reach Tongva territory, marking the beginning of Spanish colonization. Franciscan padre Junipero Serra accompanied Portola. Within two years of the expedition, Serra had founded four missions, including Mission San Gabriel, founded in 1771 and rebuilt in 1774, and Mission San Fernando, founded in 1797. The people enslaved at San Gabriel were referred to as "Gabrieleños", while those enslaved at San Fernando were referred to as "Fernandeños". Although their language idioms were distinguishable, they did not diverge greatly, and it is possible there were as many as half a dozen dialects rather than the two which the existence of the missions has lent the appearance of being standard. The demarcation of the Fernandeño and the Gabrieleño territories is mostly conjectural and there is no known point in which the two groups differed markedly in customs. The wider Gabrieleño group occupied what is now Los Angeles County south of the Sierra Madre and half of Orange County, as well as the islands of Santa Catalina and San Clemente.