King Dongmyeong, also known by the birth-name Jumong (surname: Go) was the first Taewang of Gorguryeo.
source: Wikipedia
Goguryeo, along with every developed East Asian state at the time wrote using Chinese characters, which was the universal writing system in East Asia.
Upon unifying China, the Sui dynasty attempted to establish dominance over all its neighbors and declare itself as the region's superpower. It managed to subjugate Japan, Vietnam, Tibet, and Southern Korea but Goguryeo (the most powerful of the three kingdoms of Korea) refused to acknowledge the Sui Dynasty's supremacy. This caused the Sui to invade Goguryeo resulting in the Goguryeo-Sui war. Goguryeo managed to defeat the Sui dynasty and after two failed invasions, the Sui dynasty failed economically which resulted in resentment of the Chinese people and ultimately the downfall of the dynasty. In essence, Goguryeo was the most significant factor contributing to the downfall of the Sui.
The ancient Korean civilization dates back to around 2333 BCE, traditionally marked by the founding of Gojoseon, the first Korean kingdom. Over the centuries, several other significant states emerged, including the Three Kingdoms of Korea—Goguryeo, Baekje, and Silla—during the first few centuries CE. This period laid the foundation for Korea's cultural and historical development, influencing its society through the ages. The ancient civilization continued to evolve until the unification of Korea under the Silla Kingdom in the late 7th century CE.
There are many important historical figures throughout the History of Korea. Determining which of them is the MOST important person is up to your personal opinion. Some of the most important Korean historical figures include, Dangun of Gojoseon (legendary founder of Gojoseon, the first Korean kingdom), Gwanggaeto the Great of Goguryeo (credited with making the Korean kingdom Goguryeo into a major Asian power), Wang Geon of Goryeo (credited with the founding of Goryeo as well as the complete unification of the Korean peninsula), King Sejong the Great of Joseon (credited with the creation of Hangul, the Korean alphabet, as well as the conquest of Tsushima and other regions), Admiral Yi Sun-Sin (savior of Joseon during the Imjin War and inventor of the ingenuous turtle ship), and Syngman Rhee and Kim Il-Sung (for dividing the Korean peninsula after 1300 years of unification).
The three kingdoms in Korea were named Goguryeo, Baekje, and Silla.
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Sino-Corean War [Goguryeo-Sui War] (598-614) -The Sui dynasty of China invaded the Korean kingdom Goguryeo with a supposed force of over a million soldiers. This resulted in a tremendous Goguryeo victory and the destruction of the Chinese Sui dynasty.
Goguryeo ended in 668.
an ancient artifact from goguryeo
Anjang of Goguryeo died in 531.
Sansang of Goguryeo died in 227.
Bongsang of Goguryeo died in 300.
Dongcheon of Goguryeo died in 248.
Dongcheon of Goguryeo was born in 209.
Yeongnyu of Goguryeo died in 642.
Sosurim of Goguryeo died in 384.
Bojang of Goguryeo died in 682.