In 607, Prince Shotoku sent Imoko ONO as an envoy to Sui (China) and sent a diplomatic message to the Sui emperor with the wording 'The Emperor in the Land of the Rising Sun sends a letter to the Emperor in the Land of Setting Sun.'
607年、小野妹子らを隋に遣隋使として遣わして、隋の皇帝に「日出る処の天子、書を日没する処の天子に致す。