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King Sejong the Great had many inventions and achievements while he ruled the Joseon Dynasty.

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Born in 15th of May, 1397, he was the 3rd son from King Taejong. When he was twelve, he became Grand Prince Chungnyeong. As the third son of Taejong, Sejong's ascension to the throne was unique. Taejong's eldest son, Yangnyeong, was named heir apparent in 1404. However, Yangnyeong was a trouble maker and this resulted in his removal of the heir. And Taejong's second son went into a Buddha temple. Because of this, Chungnyeong became the heir.

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Science, technology, and agriculture {20629 이지원}

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Science, technology, and agriculture {20629 이지원}

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Sejong promoted the sciences. He wanted to help farmers so he decided to create a farmer's handbook. The book—the Nongsa jikseol—contained information about the different farming techniques that he told scientists to gather in different regions of Korea. One of his close associates was the great Korean inventor Jang Yeong-sil. Jang created new significant designs for water clocks, armillary spheres, and sundials. In 1442, Jang made one of the world's first standardized rain gauges named Cheugugi. Jang also made the first Korean celestial globe under the reign of King Sejong Sejong. Sejong had his astronomers create a calendar with the Joseon capital of Seoul as the primary meridian. In the realm of traditional Korean medicine, two important treatises were written during his reign. These were the Hyangyak jipseongbang and the Euibang yuchwi.

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From many of King Sejong's inventions, the most popular one would be Hangul, the native phonetic writing system for the Korean language. Before the invention of hangul, only highly-educated people in Joseon could use the Chinese letters. There was much difficulty in learning how to use Chinese characters for the lower classes. To solve this problem, King Sejong created Hangul to make Koreans from all classes read and write. Hangul was completed in 1443 and published in 1446 along with a 33-page manual titled Hunmin Jeong-eum.

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King Sejong reorganized the Korean government by appointing people from different social classes as civil servants. Furthermore, he performed official government events according to Confucianism, and he encouraged people to behave according to the teachings of Confucianism. As a result, Confucianism became the social norm of Korea at the time.

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Music from the early Joseon dynasty to Goryeo music was  mixed with Chinese music, but it was sorted in Sejong University, Which was the revival of 아악 and the creation of 향악

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Sejong was blinded in the later days of his life and died in 1450. Almost 500 years later, King Sejong is still near us with the 10000-won bill.