Frederick IV, Duke of Austria, was a member of the House of Habsburg, born in 1382. He ruled as Duke from 1406 until his death in 1439. Frederick was known for his efforts to consolidate Habsburg power in the region and for his involvement in various political alliances. During his reign, Frederick IV faced challenges from rival factions and sought to expand his influence through strategic marriages and territorial acquisitions. His leadership contributed to the Habsburg dynasty's prominence in European politics, setting the stage for future rulers like Frederick III and Maximilian I.