Unified Silla

History

In 660, King Munmu ordered his armies to attack Baekje. General Kim Yu-sin, aided by Tang forces, defeated General Gyebaek and conquered Baekje. In 661, he moved on Goguryeo but was repelled. Silla then fought against the Tang dynasty for nearly a decade.

During its heyday, the country contested with Balhae, a Goguryeo–Mohe kingdom, to the north for supremacy in the region. Throughout its existence, Unified Silla was plagued by intrigue and political turmoil in its newly conquered northern territory, caused by the rebel groups and factions in Baekje and Goguryeo, which eventually led to the Later Three Kingdoms period in the late 9th century.

Gyeongju remained the capital of Silla throughout the whole existence of the dynasty, which demonstrates the power of the governmental system employed in Silla. By using the "Bone Clan Class" system, a small group of powerful people (the 'bone clan') was able to rule over a large number of subjects. To maintain this rule over a large number of people for an extensive period of time, it was important for the government to keep the unity of the bone-rank system and hold the governed subjects in a low social status.

Despite its political instability, Unified Silla was a prosperous country, and its metropolitan capital of Seorabeol (present-day Gyeongju) was the fourth-largest city in the world at the time. Through close ties maintained with the Tang dynasty, Buddhism and Confucianism became the principal philosophical ideologies of the elite as well as the mainstays of the period's architecture and fine arts. Its last king, Gyeongsun, ruled over the state in name only and submitted to Wang Geon of the emerging Goryeo in 935, bringing the Silla dynasty to an end.

Government

Regional administration

Culture

Unified Silla carried on the maritime prowess of Baekje, which has been likened to the "Phoenicia of medieval East Asia", and during the 8th and 9th centuries dominated the seas of East Asia and the trade between China, Korea and Japan, most notably during the time of Chang Pogo; in addition, Silla people made overseas communities in China on the Shandong Peninsula and the mouth of the Yangtze River.

Unified Silla was a golden age of art and culture, as evidenced by the Hwangnyongsa, Seokguram, and Emille Bell. Buddhism flourished during this time, and many Korean Buddhists gained great fame among Chinese Buddhists and contributed to Chinese Buddhism, including: Woncheuk, Wonhyo, Uisang, Musang, and Kim Gyo-gak, a Silla prince whose influence made Mount Jiuhua one of the Four Sacred Mountains of Chinese Buddhism.

Unified Silla and the Tang maintained close ties. This was evidenced by the continual importation of Chinese culture. Many Korean monks went to China to learn about Buddhism. The monk Hyecho went to India to study Buddhism and wrote an account of his travels. Different new sects of Buddhism were introduced by these traveling monks who had studied abroad such as Seon and Pure Land Buddhism. A small Muslim presence also existed during this time.

Unified Silla conducted a census of all towns' size and population, as well as horses, cows and special products and recorded the data in Minjeongmunseo (민정문서). The reporting was done by the leader of each town.

A national Confucian college was established in 682 and around 750 it was renamed the National Confucian University. The university was restricted to the elite aristocracy. However, in Silla society, because the bone-rank system was used for the election of officials rather than the imperial examination process that was used in Confucianism, the National Confucian University did not have great appeal to the nobility class of Silla.

Silla was very scientifically and technologically advanced for the time. There was an emphasis put on astrology especially as it was closely tied to agriculture. This allowed them to accurately record events such as solar eclipses and lunar eclipses.

Woodblock printing

Woodblock printing was used to disseminate Buddhist sutras and Confucian works. During a refurbishment of the "Pagoda That Casts No Shadows", an ancient print of a Buddhist sutra was discovered. The print is dated to 751 CE and is one of the oldest discovered printed material in the world.

Architecture

Architecture during the Unified Silla period reflected both the political unification of the Korean peninsula and the growing influence of Buddhism. Following Silla’s victories over Paekche and Koguryŏ with Tang Chinese support, the capital city of Kyŏngju was reorganized along a rectangular grid modeled after the Tang capital of Chang’an. This urban design reflected broader cultural exchange with China and marked Kyŏngju as the center of artistic and architectural development in Korea. Buddhist architecture flourished during this time, with large temple complexes dominating the landscape and pagodas rising above the city skyline. Many temples were constructed or expanded, often incorporating carefully planned courtyards, gates, lecture halls, and covered walkways arranged along central axes.

One of the most important surviving examples is Pulguk Temple, built in the mid eighth century. Its layout demonstrates the structured design of Unified Silla temples, with stone staircases leading to courtyards that contain symmetrically placed pagodas. The simpler three story Sŏkkat’ap pagoda represents the historical Buddha, while the more elaborate Tabot’ap pagoda symbolizes the Buddha of the past, illustrating Buddhist teachings through architectural form. Another remarkable achievement is the nearby Sŏkkuram grotto, a carefully engineered granite cave shrine housing a monumental seated Buddha surrounded by relief sculptures. Together these monuments highlight the technical skill, symbolic planning, and spiritual significance that defined Unified Silla architecture.