Vehse, Carl Eduard ; Demmler, Franz K. F., Memoirs of the court of Prussia, T. Nelson and sons, 1854, p. 303, OCLC 2567974.
«A remarkable man among these Italians, was Count Spiridion Lusi; who, properly speaking, was a Greek, being a native of the island of Cephalonia, which at that time belonged to the Venetian republic. He got into the service of the king, in 1777, at the age of forty-two, in a very remarkable manner; which equally shows Lusi's eminent qualifications for a diplomatical career, and the king's extraordinary talent for selecting the fittest persons for it.»