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While the Maltese Islands were under the dominion of the Knights of Malta, from the 15th century through to the late 18th century, the Grand Master had the status of a prince of the Catholic Church, and enjoyed a special relationship with the Pope, which occasionally led to a considerable amount of friction with the local Bishops.
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.
He also published a History of the Maltese Islands and excavated important archaeological sites, such as the Hypogeum and the megalithic Tarxien Temples, Ħaġar Qim and Mnajdra, which have since been declared UNESCO World Heritage Sites.