Frederick IV, Duke of Austria (b. 1382)
Frederick IV (1382 – 24 June 1439), also known as Frederick of the Empty Pockets (German: Friedrich mit der leeren Tasche), a member of the House of Habsburg, was Duke of Austria from 1402 until his death. As a scion of the Habsburg Leopoldian line, he ruled over Further Austria and the County of Tyrol from 1406 onwards.