The term "James IV" refers to a historical figure rather than a common English word. Here’s a simple explanation:
James IV (noun) - He was a king of Scotland from the Stuart family. He was born in 1473 and died in 1513. He is known for marrying a daughter of Henry VII of England and for leading Scotland in an invasion of England during a war between England and France. He was defeated at the Battle of Flodden.
James IV was a king of Scotland known for his marriage ties to England and his military actions.