In the 14th century, small domains scattered on Okinawa Island were unified into three principalities: Hokuzan (北山, Northern Mountain), Chūzan (中山, Central Mountain), and Nanzan (南山, Southern Mountain). This was known as the Three Kingdoms, or Sanzan (三山, Three Mountains) period. Hokuzan, which constituted much of the northern half of the island, was the largest in terms of land area and military strength but was economically the weakest of the three. Nanzan constituted the southern portion of the island. Chūzan lay in the center of the island and was economically the strongest. Its political capital at Shuri, Nanzan was adjacent to the major port of Naha, and Kume-mura, the center of traditional Chinese education. These sites and Chūzan as a whole would continue to form the center of the Ryukyu Kingdom until its abolition.Many Chinese people moved to Ryukyu to serve the government or to engage in business during this period. At the request of the Ryukyuan King, the Ming Chinese sent thirty-six Chinese families from Fujian to manage oceanic dealings in the kingdom in 1392, during the Hongwu emperor's reign. Many Ryukyuan officials were descended from these Chinese immigrants, being born in China or having Chinese grandfathers. They assisted the Ryukyuans in advancing their technology and diplomatic relations. On 30 January 1406, the Yongle Emperor expressed horror when the Ryukyuans castrated some of their own children to become eunuchs to serve in the Ming imperial palace. Emperor Yongle said that the boys who were castrated were innocent and did not deserve castration, and he returned them to Ryukyu, and instructed the kingdom not to send eunuchs again. According to statements by Qing imperial official Li Hongzhang in a meeting with Ulysses S. Grant, China had a special relationship with the island and the Ryukyu had paid tribute to China for hundreds of years, and the Chinese reserved certain trade rights for them in an amicable and beneficial relationship.These three principalities (tribal federations led by major chieftains) battled, and Chūzan emerged victorious. The Chūzan leaders were officially recognized by Ming dynasty China as the rightful kings over those of Nanzan and Hokuzan, thus lending great legitimacy to their claims. The ruler of Chūzan passed his throne to King Hashi; Hashi conquered Hokuzan in 1416 and Nanzan in 1429, uniting the island of Okinawa for the first time, and founded the first Shō Dynasty. Hashi received the surname "Shō" (Chinese: "Shang") 尚 from the Ming emperor in 1421, becoming known as Shō Hashi (Chinese: Shang Bazhi) 尚巴志.Shō Hashi adopted the Chinese hierarchical court system, built Shuri Castle and the town as his capital, and constructed Naha harbor. When in 1469 King Shō Toku, who was a grandson of Shō Hashi, died without a male heir, a palatine servant declared he was Toku's adopted son and gained Chinese investiture. This pretender, Shō En, began the Second Shō Dynasty. Ryukyu's golden age occurred during the reign of Shō Shin, the second king of that dynasty, who reigned from 1478 to 1526.The kingdom extended its authority over the southernmost islands in the Ryukyu archipelago by the end of the 15th century, and by 1571 the Amami Ōshima Islands, to the north near Kyūshū, were incorporated into the kingdom as well. While the kingdom's political system was adopted and the authority of Shuri recognized, in the Amami Ōshima Islands, the kingdom's authority over the Sakishima Islands to the south remained for centuries at the level of a tributary-suzerain relationship.

Question: In what year did King Sho Toku die?
Answer: 1469