On the contrary, he was a close collaborator and a personal friend of the Grand Master of the Knights Hospitallers, Manuel Pinto da Fonseca, who immediately, on Demarco’s return to Malta, chose him as Principle Medical Officer for the Maltese Islands.
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From February 1773, he organised a group of fellow priests who, eventually, took up arms against Francisco Ximenes de Texada, the Grand Master of the Knights Hospitallers, in protest for retracting some of their rights and privileges.
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More so since the then Grand Master of the Knights Hospitallers, António Manoel de Vilhena, had given free entry to the harbours to all nations.
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In 1788, when Demarco was 70 years of age (and already in poor health himself), the Grand Master of the Knights Hospitallers, Emmanuel de Rohan-Polduc, requested that he went to Tripoli, then an Ottoman province, to see to the health of the pasha there, who was gravely ill.
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Before his position as Master, he had been grand prior of Saint-Gilles.
John and his wife, Alice de Montaigu—who was the niece of the archbishop of Nicosia, of Guerin, Hospitaller grand master, and of Peter, Templar grand master—had one son (perhaps named Eudes), who died in infancy, and several daughters besides Margaret.
Raphael Cotoner (Rafael Cotoner i d'Olesa; died 20 October 1663) was the 60th Grand Master of the Knights Hospitaller or, as it is already known by that time, the Order of Malta, serving in that position from 5 June 1660 to his death on 20 October 1663 following the brief reign of Annet de Clermont-Gessant.