In the saryan wahen (Coup of Shinryo IWAYA) which occurred in 1544, the Jinshin Yakujo concluded between the So clan and the Yi-Dynasty in 1512 was denounced; thereafter, trading (trade concurrent with a diplomacy visit) from Japan was inhibited except for the King of Japan envoy (the Muromachi bakufu [Japanese feudal government headed by a shogun] envoy) and the envoys from the Ouchi clan and the Shoni clan.
1544年に発生した蛇梁倭変により、1512年に宗氏と朝鮮王朝の間で締結された壬申約条は破棄され、日本国王使（室町幕府使節）および大内氏・少弐氏の使節を除き、日本からの通交（外交を兼ねた貿易）は禁じられた。