What is the full name of the eldest sibling who performed for the Empress Maria Theresa at the Imperial Court during a visit to Vienna in 1762?
Maria Anna Mozart Maria Anna Walburga Ignatia Mozart (30 July 1751 – 29 October 1829), called Marianne and nicknamed "Nannerl", was a musician, the older sister of Wolfgang Amadeus Mozart and daughter of Leopold and Anna Maria Mozart.
Princess Sophie Friederike of Thurn and Taxis Princess "Sophie Friederike" Dorothea Henriette of Thurn and Taxis, full German name: "Sophie Friederike Dorothea Henriette, Prinzessin von Thurn und Taxis" (20 July 1758 in Regensburg, Free Imperial City of Regensburg, Holy Roman Empire – 31 May 1800) was a member of the House of Thurn and Taxis and a Princess of Thurn and Taxis by birth and a member of the House of Radziwiłł and Princess Radziwiłł through her marriage to Prince Hieronim Wincenty Radziwiłł. Sophie Friederike was briefly a member of the Kazanowski and Ostroróg Polish noble families through subsequent marriages. She was known as "the Jewel of Regensburg."