Sukjong of Goryeo

King Sukjong ordered the minting and circulation of bronze coins, known as 'haedong tongbo', to replace barter and cloth currency. This reform aimed to standardize trade and strengthen the Goryeo economy, though adoption was slow and limited to certain regions.

Sukjong initiated the construction of a new secondary capital at Namgyeong (modern Seoul) to strengthen royal authority and counterbalance the influence of the Kaesong aristocracy. The project included palaces and defensive walls, but was not completed during his reign.

Sukjong faced a rebellion led by the powerful aristocrat Yi Ja-gyeom, who opposed the king's centralizing reforms. The rebellion was suppressed, but Sukjong died shortly after, leaving the conflict unresolved.