Gwanghaegun of Joseon  Gwanghae-gun or Prince Gwanghae (4 June 1575 – 7 August 1641; reigned 1608–1623) was the fifteenth king of the Joseon dynasty. His personal name was "Yi Hon". As he was deposed in a coup d'état, later official historians did not give him a temple name like Taejo or Sejong. Gwanghaegun was the second son of King Seonjo, born to Lady Kim (Gongbin), a concubine. When Japan invaded Korea to attack the Ming Empire, he was installed as Crown Prince. When the king fled north to the border of Ming, he set up a branch court and fought defensive battles. During and after the Seven Year War (1592–1598), he acted as the de facto ruler of the Joseon Dynasty, commanding battles and taking care of the reconstruction of the nation after the devastating wars, in the place of old and weak King Seonjo. Although it brought prestige to him, his position was still unstable. He had an elder but incompetent brother Prince Imhae (Imhaegun, 임해군, 臨海君) and a younger but legitimate brother Grand Prince Yeong-chang (Yeong-chang Daegun, 영창대군, 永昌大君), who was supported by the Lesser Northerners faction. Fortunately for Gwang-hae, King Seonjo's abrupt death made it impossible for his most favorite son Yeong-chang Daegun to succeed to the throne. Before King Seonjo died, he named Prince Gwang-hae as his official successor to the throne and ordered his advisers to make a royal document. However, Lyu Young-gyong of the Lesser Northerners faction hid the document and plotted to install Prince Yeong-chang as king, only to be found out by the head of the Great Northerners faction (대북; 大北), Chung In-hong. Lyu was executed immediately and Prince Yeong-chang was arrested and died the next year. After the incident, Gwang-hae tried to bring officials from various political and regional background to his court, but his plan was interrupted by Greater Northerners including Lee Icheom and Chung In-hong.