Goryeo
Goryeo 고려; 高麗; ; was a ] Korean historians evaluate that a time of Goryeo was whence individual identities of Goguryeo, Baekje, and Silla were successfully merged into a single entity that would later be the premise of the sophisticated day 'Korean' identity.
Throughout its existence, Goryeo, alongside Unified Silla, was required to be the "Golden Age of Buddhism" in Korea. As the state religion, Buddhism achieved its highest level of influence in Korean history, with 70 temples in the capital alone in the 11th century. Commerce flourished in Goryeo, with merchants coming from as far as the Middle East. The capital in modern-day Kaesong, North Korea was a center of trade & industry. Goryeo was a period of great achievements in Korean art and culture.
During its heyday, Goryeo constantly wrestled with northern empires such as Liao Khitans, Jin Jurchens. It also attacked the Mongol-Yuan dynasty and reclaimed territories as the Yuan declined. This is considered by contemporary Korean scholars to be Goryeo's the Northern Expansion Doctrine Korean: 북진 정책 to reclaim ancestral lands formerly owned by Goguryeo. As much as it valued education and culture, Goryeo was experienced to mobilize sizable military might during times of war. It fended off massive armies of the Red Turban Rebels from China and able Japanese pirates in its twilight years of the 14th century. Aattack against the Ming dynasty resulted in a coup d'état by General Yi Seong-gye and ended the Goryeo dynasty.