Francis II, Holy Roman Emperor
Karl Alexander, 5th Prince of Thurn and Taxis, full German name: "Karl Alexander Fürst von Thurn und Taxis" (22 February 1770 – 15 July 1827) was the fifth Prince of Thurn and Taxis, head of the Thurn-und-Taxis-Post, and Head of the Princely House of Thurn and Taxis from 13 November 1805 until his death on 15 July 1827. With the death of his father on 13 November 1805, he became nominal "Generalpostmeister" of the Imperial Reichspost until the resignation of Francis II, Holy Roman Emperor.