context: Goryeo Taejo (高麗 太祖, January 31, 877 (January 14th of the lunar calendar) [1] to July 4, 943 (May 29th of the lunar calendar) [2]) after the post-Three Kingdoms period It is the general of Goguryeo (後 高句麗) and the king of Goryeo's invitation (reign: July 25, 918 to July 4, 943). The castle is the king, the bent building, the main building is Kaesong, the ruler is Yakcheon, Myoho is Taejo, and Shiho is Nguyen Won Myeong-ryang It is the Great King of the Great Sacred Dragon, the Great King of the Great Gods. Yeonho is Cheonsu and Cheonho is Hyunneung.
question: How many kings was Goryeo Taejo?
answers.text: invitation