Sigismund, Archduke of Austria

Sigismund of Austria, Duke, then Archduke of Further Austria (26 October 1427 – 4 March 1496) was a Habsburg archduke of Austria and ruler of Tirol from 1446 to 1490.

Sigismund (or Siegmund, sometimes also spelled Sigmund) was born in Innsbruck; his parents were Frederick IV, Duke of Austria and Anna of Brunswick (). He was a first cousin of Frederick III, Holy Roman Emperor, who served as regent until 1446.

In 1446, upon the end of the regency of Frederick III, he acceded to rulership over Tirol and (other) Further Austria Vorderösterreich, which included the Sundgau in the Alsace, the Breisgau, and some possessions in Swabia. In 1449, he married Eleanor of Scotland, the daughter of James I, King of Scots.

For much of his reign, Sigismund was engaged in disputes with Nicholas of Cusa, then bishop of Brixen, for the control of the Eisack, Puster and Inn valleys. In 1460, when he had Nicholas imprisoned, he was excommunicated by Pope Pius II. The bishop fled to Todi, but died before the archduke surrendered in order to receive the papal pardon.

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