What was the currency of Goryeo?

The coins, cast in both bronze and iron, were called tongbo and jungbo. Additionally, silver vases called ŭnbyŏng were widely used and circulated as a currency among the aristocracy of Goryeo. [1] It was not until the beginning of the Joseon period that copper coins called mun were minted for wide circulation.

What is iron coin in Gungeon proper?

Defeat the boss of the Gungeon Proper without getting hit. A payment for services rendered. This mysterious coin vanishes when tossed into the air. Iron Coin is an active item . Upon use, kills all enemies in a random unexplored room of the current floor. Where the effect took place, a note can be found lying in a pool of blood on the ground.

What were grain coins used for in ancient Korea?

Grain coins were put to use within the kingdoms for a long period of time. While in ancient Korea various items like clam shells, iron, and precious metals were all traded as a medium of exchange, but the primary forms of currency during this era used in bartering were grain and cloth. [3]

What are demonstration coins?

The term is not perfectly defined, however, since a number of metals have been used to make "demonstration coins" which have never been used to make monetized coins for any nation-state, but could be. Some of these elements would make excellent coins in theory (for example, zirconium), but their status as coin metals is not clear.