A teenage boy from the Kumeyaay village of Kosa'aay (Cosoy, known today as Old Town, San Diego) who had often visited the mission before the outbreak of hostilities, resumed his visits with the friars. He soon learned enough Spanish for Serra to view him as an envoy to help convert the Kumeyaay. Serra urged the boy to persuade some parents to bring their young child to the mission, so that Serra could administer Catholic baptism to the child by pouring water over his head.