A letter sent to Sadayuki HOJO (Rokuhara Tandai [an administrative and judicial agency in Rokuhara, Kyoto]), a son of the regent, Sadaaki HOJO at an unknown date (1329 is the widely-accepted theory) says that Kotoku-in zoeiryotosen (a group of traveling vessels that were dispatched to the Yuan dynasty in order to make profits to cover the costs of repair and construction of Kotoku-in Temple) was scheduled to travel to Sung in the following year.
年次不明（元徳元年（1329年）説が有力）の前執権北条貞顕の息子北条貞将（六波羅探題）宛て書状に、翌春に高徳院造営料唐船が渡宋する予定であると書かれている。