Claim: António Manoel de Vilhena, born of Portuguese nobility, 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. King Charles IV
King Charles V 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. 
King Charles IV
King Charles V António Manoel de Vilhena was born in Lisbon on 28 May 1663 to the aristocrat and general Dom Sancho Manoel de Vilhena, 1st Count de Vila Flor and his first wife, Ana de Noronha. 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.