was a local ruler of Okinawa Island, who was given the title of King of Sannan. He first contacted the Chinese emperor in 1403, claiming himself to be a younger brother or cousin of Shà Âsatto, the late King of Sannan, who reportedly had no son. à Âà Âso was given the title in the next year. His last contact was of 1413. In 1415, Taromai, who styled himself Crown Prince, reported à Âà Âso's death. He claimed that à Âà Âso was killed by his elder brother Tabuchi, who had in turn been killed by local chiefs, in favor of Crown Prince Taromai.
His real name is unknown. The name à Âà Âso is enigmatic and highly un-Okinawan. A desperate attempt of decipherment relates it to Yaese (å «éÂÂç¬), a fortress in southern Okinawa.
Historian Ikuta Shigeru speculates that the King of Sannan was a puppet of the King of Chà «zan from the very beginning. According to his theory, à Âà Âso reported to the Chinese emperor that King Shà Âsatto had no son because Shà Âsatto and his offsprings actually defected to Korea in 1398. Before the recognition by the Chinese emperor, à Âà Âso was appointed as King of Sannan by the King of Chà «zan.
Similarly, historian Wada Hisanori suspects that à Âà Âso was not a younger brother or cousin of King Shà Âsatto and that it was a made-up story to eliminate Chinese suspicion. Based on the assumption that by that time, Shà  Hashi, the unifier of Okinawa Island, had already kept Sannan under his control, Wada claims that à Âà Âso was either a pseudonym of Shà  Hashi or his puppet ruler.
The Chà «zan Seikan (1650) and Sai Taku's edition of the Chà «zan Seifu (1701) made no mention of à Âà Âso, suggesting that the name of à Âà Âso was not transmitted among the Okinawan society. Sai On's edition of the Chà «zan Seifu (1725) drastically rewrote history. Having access to Chinese diplomatic records, he added the records of tributary missions sent under the name of à Âà Âso. Sai On dated à Âà Âso's death to 1414.