Empress of Austria (1717–1780) and mother of Marie Antoinette. ALS in German, one page, 7.25 x 9, black-bordered letterhead, May 23, 1767. Crisply penned letter to Hungarian Prince Esterhazy, apparently a Formal condolence letter to the Prince and his family,who were the one of the most powerful and richest families in the Hapsburg Empire. They had their own armies and tax revenues in their Domain. Empress Maria Theresa had to be very diplomatic in order to secure their loyalty and army support,in her wars. Small pencil notation at bottom, small tear to top of integral second page, and just a hint of mild toning, otherwise fine condition. RRAuction COA.