Francis I, Holy Roman Emperor
From 1 February 1743 to 1745, Alexander Ferdinand served as Principal Commissioner for Charles VII, Holy Roman Emperor at the Perpetual Imperial Diet in Frankfurt am Main. When the Diet relocated to Regensburg under Francis I, Holy Roman Emperor, Alexander Ferdinand was reinstated as Principal Commissioner in 1748. It was for this reason that Alexander Ferdinand moved the principal residence of the Princely House of Thurn and Taxis from Frankfurt am Main to Regensburg. On 30 May 1754, Alexander Ferdinand was added to the College of Imperial Princes.