condition that the Sō clan control and stop any coastal pirate raids. After the conclusion of this treaty the activities of wokou were further suppressed. The number of trade ships from Tsushima to Korea was decided by this treaty (50 ships a year), and the Sō clan monopolized the trade with Korea. In 1510, Japanese traders initiated an uprising against Joseon's stricter policies on Japanese traders from Tsushima and Iki coming to Busan, Ulsan and Jinhae to trade. The Sō Clan supported the uprising, but it was eventually suppressed by local authorities. The uprising was later came to be known as the "Disturbance of the Three Ports". A more restrictive treaty was re-imposed under the direction of King Jungjong in 1512, but this Treaty of Imsin was enacted only under strictly limited terms, and only twenty-five ships were allowed to visit Joseon annually until "Japanese riots in Saryangjin" (사량진왜변, 蛇梁鎭倭變) in 1544. Korean exports included rice, cotton, ginseng, and Sutra texts. In exchange, the Sō clan provided copper, tin, sulfur, medicinal herbs, and spices from both Tsushima island and Japan. The Sō clan became a trading hub between Korea and Japan and benefited greatly from it. The relationship between Korea and residents of Tsushima Island greatly improved thereafter; there were numerous records of hospitality towards shipwrecked Korean sailors who ended up on the island, and merchants from Tsushima Island enjoyed special privileges in Korean ports. Aftermath according to Japanese sources In Kyoto, rumors of the invasion spread around the end of the 6th month. The raid was associated with the Mongol invasions of Japan. Between the 7th and 8th month, Shōni Mitsusada, the overlord of the Sō clan, reported to the Ashikaga shogunate that the Shōni's deputy Sō Uemon had defeated Korean invaders. However, Korean captives were reported to have stated that forces from Ming China were planning to invade Japan. Since shōgun Ashikaga Yoshimochi took a harder stance toward the Ming than his father Yoshimitsu, the threat was taken seriously by the shogunate. Later, the shōgun received a report from the Kyūshū Deputy. Since it was considerably different from the Shōni's version, the shōgun felt the necessity of examining Korea's real intentions. In a letter to Sō Sadamori issued on the 15th of the 7th month, the Joseon claimed that Tsushima belonged to Gyeongsang Province and asked him to leave the island, either by coming to the Korean Peninsula