Sejong the Great · every age

What was Sejong the Great doing at 24?

King at 21, created the Korean alphabet at 46

1. c. 1421

   Named his son Yi Hyang crown prince

   The boy began attending the royal lectures with him.

   Source: en.wikipedia.org
2. c. 1421

   Let peasants report their own harvests to curb tax fraud

   He also founded a medical school and made Gyeongbokgung his main palace that year.

   Source: en.wikipedia.org