After the Europeans arrived in California, the population declined from diseases introduced by the Europeans. Beginning in 1783, mission ecclesiastical records show that Coast Miwok individuals began to join Mission San Francisco de Asis, now known as Mission Dolores. They started joining that mission in large numbers in 1803, when the marriages of 49 couples from their Huimen and Guaulen local tribes (San Rafael and Bolinas Bay) appeared in the Mission San Francisco Book of Marriages. Local tribes from farther and farther north along the shore of San Pablo Bay moved to Mission San Francisco through the year 1812. Then in 1814 the Spanish authorities began to split the northern groups—Alagualis, Chocoimes (alias Sonomas), Olompalis, and Petalumas—sending a portion of each group to Mission San Francisco and another portion to Mission San Jose in the southeast portion of the San Francisco Bay Area. By the end of the year 1817, 850 Coast Miwok had been converted.