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Unified Silla

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Unified Silla, also known as Late Silla or Greater Silla, was a major period in Korean history. It began after the Silla kingdom conquered Goguryeo in 668 AD. This victory ended the Three Kingdoms period on the Korean peninsula. This era unified the central and southern regions of the land. However, the kingdom did not control the entire peninsula. A kingdom called Balhae controlled the northern areas during this time. This era is part of the larger Northern and Southern States period. Unified Silla lasted for 267 years until its fall in 935 AD.

The unification happened through a series of military alliances and wars. In 660 AD, King Munmu ordered attacks against the kingdom of Baekje. Silla formed an alliance with the Tang dynasty of China to succeed. General Kim Yu-sin led these forces to defeat General Gyebaek. After conquering Baekje, Silla moved against Goguryeo in 661 AD. However, they were initially repelled by those forces. Silla then fought the Tang dynasty for nearly ten years. Eventually, Silla annexed the southern part of Goguryeo to complete the unification.

The people of this era viewed themselves as a single, unified people. They used the term "Samhan iltong," which means the unity of the three kingdoms. This term included Silla, Goguryeo, and Baekje. General Kim Yu-sin used this phrase in a letter to King Munmu. King Munmu is recognized as the first ruler of this unified period. Later, King Sinmun reinforced this unity through administrative changes. He established "nine counties" and "nine legions" to organize the state. In the ancient Sinosphere, the number nine represented great things. Using this number helped signal the importance of the entire realm.

Silla's government relied on a strict social hierarchy called the Bone Clan Class system. This system allowed a small group of powerful nobles to rule. These "bone clan" members held the highest ranks in society. The government maintained control by keeping subjects in lower social statuses. This system was used to elect officials rather than using imperial exams. Because of this, the National Confucian University had little appeal to the nobility. Even so, the capital city of Gyeongju, or Seorabeol, remained a powerful center. It was a massive metropolitan hub and the fourth-largest city in the world.

Unified Silla was a dominant maritime power in East Asia. They controlled trade routes between China, Korea, and Japan. Some historians compare their sea power to the Phoenicians of the Mediterranean. During the 8th and 9th centuries, Silla merchants dominated these waters. A famous leader named Chang Pogo helped maintain this maritime influence. Silla people even established overseas communities in China. They lived on the Shandong Peninsula and near the Yangtze River. This trade brought great wealth and cultural exchange to the kingdom.

The culture of Unified Silla was defined by Buddhism and Confucianism. Many monks traveled to China and India to study religious texts. The monk Hyecho wrote about his travels to India. These travelers introduced new Buddhist sects like Seon and Pure Land Buddhism. This period was a golden age for art and architecture. The capital city was redesigned with a rectangular grid. This design was modeled after the Tang capital, Chang’an. Famous structures include the Pulguk Temple and the Seokguram grotto. The Seokguram grotto is a granite cave containing a monumental Buddha statue.

Technological and scientific advancements were also very significant. Silla people used woodblock printing to spread religious and Confucian works. One discovered print from 751 CE is among the oldest in the world. They also studied astrology to assist with agricultural planning. This allowed them to record solar and lunar eclipses accurately. The government also used detailed census data to manage the state. They recorded town populations along with counts of cows and horses. This data was kept in documents called Minjeongmunseo.

Despite its many successes, the kingdom faced internal instability. Political turmoil and intrigue plagued the newly conquered northern territories. Rebel groups from the former Baekje and Goguryeo lands caused unrest. These conflicts eventually led to the Later Three Kingdoms period. The dynasty finally ended when King Gyeongsun submitted to Goryeo. This transition occurred in 935 AD under the leadership of Wang Geon. While the political state changed, the cultural legacy of Silla remained.

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