Albert VII, Archduke of Austria

Albert VII was the ruling Archduke of Austria for a few months in 1619 and, jointly with his wife, Isabella Clara Eugenia, sovereign of the Habsburg Netherlands between 1598 and 1621. Prior to this, he had been a cardinal, archbishop of Toledo, viceroy of Portugal and Governor General of the Habsburg Netherlands. He succeeded his brother Matthias as reigning archduke of Lower and Upper Austria, but abdicated in favor of Ferdinand II the same year, making it the shortest reign in Austrian history.

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Source: Wikipedia