Koyro was initially renowned as Goyreo was a large and influential dynasty within the empire of Mongol. Its leadership was started by King Taejon which would later lead to the merger of three kingdoms making it a strong dynasty of the time. By the time of its dissolution, it had expanded to cover almost all of Korean peninsula. Family succession in the dynasty was initialized by the son of Wang Geon who took over leadership after the death of his father making it the trend of acquiring power (Robinson, 105).
Koyro had its courts, palace and titles regarded to as an empire other than a kingdom making it the stronghold of the Mongol empire. Strengthening the rules of the land during this time involved intermarriages with the princes of Silla and Mongolian to ensure peaceful relations through such bonds. Koryo was a protectorate towards the Yuan dynasty of Mongolian and marriages between the kings of the dynasty and the Mongolian princess resulted to suctions in the Yuan court. The dynasty ran from 918 to 1392 when the leader of the Dynasty of Joseon detached it.
King Kongmin emphasized on reforms within the dynasty which led to him cutting ties with Yuan and rather forming associations with Ming China. His reign started after 1341 at which time the dynasty was undergoing troubles on governance and diverse influence from Mongolian. When he realized that the Yuan was on the process of falling, he decided to cut ties with them to ensure he remains powerful (Pines, 128). The Mongolian influence had also affected the manner in which decisions were made in Koryon thus reducing their independence. The last stroll was the death of his wife in 1365 which depressed him leading to the initialization of his fall and death.
Robinson, David M. Empire's Twilight: Northeast Asia Under the Mongols. Cambridge, Mass: Harvard University Asia Center, 2009. Print.
Pines, Yuri. The Everlasting Empire: The Political Culture of Ancient China and Its Imperial Legacy. Princeton [N.J.: Princeton University Press, 2012. Print.