 Furthermore, they cite in support of their thesis the eminent jurist Charles Dumoulin, "Customs of Paris", 1576 (included in "la Légitimité monarchique en France" by Guy Coutant de Saisseval, 1959), who considers it "common sense" to remove the princes who became foreigners in the same manner as princesses and their descendants, for the same reasons.Legitimists argue, that the interpretation of "French" and "foreign" is anachronistic; a "French" prince meant a prince of the royal house of France, in contrast to a "foreign" prince, such as the House of Lorraine (to which Guise and Mayenne belonged).Had it referred to nationality, rather than dynasty, then it would have been meaningless, for the Guise were Frenchmen and there was no prince of the blood who was not a Frenchman.