Claim: António Manoel de Vilhena was the Grand Master of the Order of Saint John during the reign of King Charles IV.
Evidence: António Manoel de Vilhena (28 May 1663 – 10 December 1736) was a Portuguese nobleman who was the 66th Prince and Grand Master of the Order of St. John of Jerusalem from 19 June 1722 to his death in 1736. Charles VI (German: Karl; Latin: Carolus; 1 October 1685 – 20 October 1740) was Holy Roman Emperor and ruler of the Austrian Habsburg Monarchy from 1711 until his death, succeeding his elder brother, Joseph I. Charles died in 1740, sparking the War of the Austrian Succession, which plagued his successor, Maria Theresa, for eight years.