King Henry IV was a monarch of England who ruled from 1399 to 1413. He was the first king from the House of Lancaster and came to power after deposing King Richard II. His reign was marked by internal strife, including conflicts with rebellious nobles and the Welsh leader Owain Glyndŵr. Henry IV faced challenges in maintaining his authority and stability in England. He is known for his efforts to consolidate power and restore order, which included military campaigns and political maneuvering. His legacy continued through his son, Henry V, who became a celebrated king in his own right.