However the first Spanish settlement in Marin was not established until 1817 when Mission San Rafael Arcángel was founded partly in response to the Russian-built Fort Ross to the north in what is now Sonoma County.
Porén, o primeiro asentamento español en Marin non se establecería ata 1817, cando se fundou a Misión de San Rafael Arcángel, en parte como resposta ao forte de Fort Ross fabricado polos rusos, ao norte do que hoxe é o Condado de Sonoma.