Frederick IV, Duke of Tyrol, was a nobleman who ruled from 1420 until his death in 1439. He was a member of the House of Habsburg and played a significant role in the politics of the region. His reign was marked by efforts to strengthen the duchy and manage its resources effectively. Frederick IV is known for his involvement in the Habsburg dynasty's expansion and for his attempts to maintain peace in Tyrol. He faced challenges from rival factions and worked to secure his territory against external threats, contributing to the stability of the region during his rule.