Reign
Iyo is not cited in many historical records, and her origin is unknown. Records claim that Iyo was a close relative of Himiko, and she acquired great political power at a very young age. Information obtained from Chinese sources and from archeological and ethnological discoveries has led Japanese scholars to conclude that Iyo was Himiko's niece. Himiko and Iyo were female shamans and that sovereignty had both a political and a religious character.
After Himiko's death, a man took power in Yamatai as ruler. However, warfare soon engulfed the polity. The ruling council met and decided to put another woman on the throne. The one chosen was Iyo, a girl only 13 years old, who succeeded in reinstating peace in her government by following the same political line adopted by Queen Himiko.
The Records of Wei describes Himiko's death and Iyo's rise in the following terms:
When Himiko passed away, a great mound was raised, more than a hundred paces in diameter. Over a hundred male and female attendants followed her to the grave. Then a king was placed on the throne, but the people would not obey him. Assassination and murder followed; more than one thousand were thus slain. A relative of Himiko named Iyo [壹與], a girl of thirteen, was [then] made queen and order was restored. (Zhang) Zheng (張政) (an ambassador from Wei), issued a proclamation to the effect that Iyo was the ruler. (tr. Tsunoda 1951:16)
Iyo continued, or restored, tributary relations between Wa and Wei; Wei officials were included among her advisors, and she sent an embassy of twenty individuals, led by her grand steward Isako, to accompany some of these Chinese officials back to China. Her embassy presented 30 Japanese female and male slaves to China as tribute, along with five thousand white pearls, two large green hooked beads, and twenty pieces of varied brocade with unique patterns.
