Changdeokgung is one of the five grand palaces in South Korea. They are Gyeongbokgung, Changdeokgung, Deoksugung, Changgyunggung, and Gyeonghuigung. The five grand palaces were not built at the same time. Changdeokgung was built as the secondary palace next to Gyeongbokgung. The construction began by King Taejong, the Third King of the Joseon Dynasty, in 1405. Taking 7 years to complete, it was finished in the year 1412.