The last few years of De Rohan's magistracy were troublesome, due to the decline of the Order because of the French Revolution. De Rohan suffered a stroke in 1792, and his health began to deteriorate. He died on 14 July 1797, and was buried at St. John's Co-Cathedral in Valletta. His last words were "I, at any rate, am the last grandmaster, at least of an order illustrious and independent." He was proven correct, since less than a year after his death, the French invaded Malta and expelled the Order from the island.