On 27 August 1775 , Louis XVI had his sister Marie Clotilde married in Versailles to Charles Emmanuel , Prince of Piedmont , eldest son of Victor Amadeus III of Sardinia and of his wife Maria Antonia of Spain . Marie Clothilde was described as passive and apathetic , which gave the perception of insensitivity , but she was , however , very close to her sister , who reportedly took her departure very hard On 27 August 1775 , Louis XVI had his sister Marie Clotilde married in Versailles by procuration to Charles Emmanuel , Prince of Piedmont , eldest son of Victor Amadeus III of Sardinia and of his wife Maria Antonia Ferdinanda of Spain .