"Alexander Ferdinand, 3rd Prince of Thurn and Taxis,[citation needed] full German name: Alexander Ferdinand Fürst von Thurn und Taxis[citation needed] (21 March 1704 – 17 March 1773)[citation needed] was the third Prince of Thurn and Taxis, Postmaster General of the Imperial Reichspost, and Head of the Princely House of Thurn and Taxis from 8 November 1739 until his death on 17 March 1773.[citation needed] Alexander Ferdinand served as Principal Commissioner (German: Prinzipalkommissar) at the Perpetual Imperial Diet in Frankfurt am Main and Regensburg for Charles VII, Holy Roman Emperor, Francis I, Holy Roman Emperor, and Joseph II, Holy Roman Emperor from 1 February 1743 to 1745 and again from 1748 until 1773." - (en.wikipedia.org 13.12.2020)