Sejong the Great · every age

What was Sejong the Great doing at 50?

King at 21, created the Korean alphabet at 46

1. c. 1447

   Composed two ritual suites; first major Hangul literature

   Pot'aep'yŏng and Chŏngdaeŏp; the Yongbiŏch'ŏn'ga poems and a rhyme dictionary appeared.

   Source: en.wikipedia.org