Sejong the Great

Hello! My name is Sejong, and many people today call me Sejong the Great. I was a king who lived a long time ago in a kingdom called Joseon, which you now know as Korea. I was born on May 15th, 1397. My father, King Taejong, was the ruler, but I was his third son, so no one expected me to become king. That was perfectly fine with me! More than anything, I loved to read. I would read any book I could get my hands on, learning about history, science, art, and how to be a good leader. My father saw how much I studied and how much I cared about our people. In 1418, he surprised everyone by choosing me to be the next king.

When I became king in 1418, I had a big dream for our kingdom. I wanted Joseon to be a place where everyone, not just the wealthy and powerful, had a chance to learn and improve their lives. I believed that knowledge was the key to a strong and happy country. One of the first things I did was gather the brightest scholars in the land. In 1420, I created a special research institute called the Hall of Worthies. Together, we worked on new ideas in science, farming, and medicine to help all of our people.

My biggest challenge was something you might take for granted: the alphabet. In my time, we used Chinese characters to write. They were very beautiful, but also very complicated. There were thousands of them! It took years to learn, so only a few scholars and rich people could read and write. This made me sad. How could farmers read books about better ways to grow food? How could ordinary people write letters to their families or read the laws of the kingdom? I decided we needed a new writing system, one so simple that anyone could learn it. I worked with my scholars for many years, and in 1443, we finished our new alphabet. We called it 'Hunminjeongeum,' which means 'The Proper Sounds for the Instruction of the People.' Today, it is known as Hangul.

Creating a new alphabet wasn't my only project! I loved science and inventing things that could solve problems. Our farmers often struggled because they didn't know how much rain had fallen. So, in 1441, my scientists and I invented the world's first standardized rain gauge, called the cheugugi. Now, farmers all over the kingdom could measure rainfall and plan their crops better. We also invented amazing water clocks that chimed to tell the time automatically and sundials that anyone could read. I encouraged doctors to write books about Korean medicine and astronomers to map the stars. I wanted to use science to make life better for everyone.

I reigned as king for 32 years and passed away on April 8th, 1450. I lived to be 52 years old. Though my time as king ended, my greatest wish came true. The alphabet I created, Hangul, is still used by millions of people in Korea today. It is celebrated around the world for being easy to learn and scientifically designed. People remember me as a king who loved his people and believed in the power of knowledge for everyone. My picture is even on the 10,000-won banknote in South Korea, reminding everyone that learning and new ideas can change the world.