Japanese Pirates Raid the Coast

Timeline

1. 1037East Asian waters · East China SeaHistorical sources and later scholarship note that maritime raids by western Japanese local magnates and fugitive samurai occurred periodically along East Asian coasts in the 11th century. Activity increased in the 1030s, attacking merchant ships and threatening key routes such as Tsushima and Iki.
2. 1037–1038Northern Kyushu coast · KyushuThe Japanese court ordered the western provinces to strengthen coastal defenses, with provincial governors and magnates organizing patrols. Records on the Korean Peninsula also document raids by the Wa people (predecessors of the wakō), prompting both sides to negotiate through diplomatic channels and reinforce coastal vigilance.