Eric IV of Denmark, also known as Eric Ploughpenny, was a king who ruled from 1241 to 1250. He was the son of Valdemar II of Denmark and Dagmar of Denmark. His reign was marked by conflicts with the nobility and struggles to maintain control over his kingdom. During his rule, Eric IV focused on consolidating power and managing the challenges posed by the Danish nobility. He faced opposition from various factions, which ultimately led to his downfall. Eric IV was deposed in 1250, and his reign is often remembered for the difficulties he encountered in governance.