After receiving a few years of local school, at age thirteen, Sun went to live with his elder brother, Sun Mei, in Honolulu. Sun Mei, who was fifteen years Sun Yat-sen's senior, had emigrated to Hawaii as a laborer and had become a prosperous merchant. Though Sun Mei was not always supportive of Sun's later revolutionary activities, he supported his brother financially, allowing Sun to give up his professional career. Sun Yat-sen studied at the prestigious Iolani School where he learned English, mathematics and science. Originally unable to speak the English language, Sun Yat-sen picked up the language so quickly that he received a prize for outstanding achievement in English from King David Kalakaua. He became a citizen of the United States and was issued an American passport.