In the spring of 1806, Rezanov sailed from Sitka to San Francisco in Spanish-held California to obtain urgently needed food supplies in exchange for otter furs. He also tried to establish an alliance with the Spanish against the United Kingdom and United States. During this visit with the Spanish of Northern California, he became enamored of María de la Concepción "Conchita" Argüello, the famously beautiful daughter of the commander of the Spanish garrison at San Francisco. They became engaged to be married, subject to religious approvals, as she was Roman Catholic and he was Russian Orthodox. Rezanov thought this potential match would be a boon to Russian/Spanish cooperation in North America.