Ryoshun interned an envoy from Ming who was sent to confer peerage of '日本国王良懐' (King of Japan Ryokai); because 'King of Japan Ryokai' seemed to be Imperial Prince Kaneyoshi.
貞世は懐良親王を指すとされている「日本国王良懐」を冊封するために派遣された明使を抑留。