Between 936 and 943, the title "dux Francorum" was revived at the request of Hugh the Great, the most powerful magnate in France. A charter of King Louis IV of 936 refers to him that way, and a charter of Hugh's own from 937 employs the title. Its usage was not exclusive, however, since the title "count" ("comes") continued to be used as well. In one charter, Louis explained that Hugh was second to him in all his kingdoms. This interpretation of the title "dux Francorum" was not universally accepted. According to Flodoard of Reims, the king only "invested Hugh with the duchy of France" in 943 in reward for the latter's help in returning the king from exile. The duchy of Francia ("ducatus Franciae") comprised the region between the Loire and the Seine, the ancient kingdom of Neustria. On this contemporary understanding, Hugh's title was analogous to that of the dukes of Aquitaine, "dux Aquitanorum", where the territorial designation ("of Aquitaine") was eschewed in favour of an ethnic one ("of the Aquitainians"). "Duke of the Franks" thus became the preferred title of the Robertian margraves of Neustria from 943. Walther Kienast suggested that the title served to connect Hugh with the previous "duces Francorum", Pippin II and Charles Martel, and buttress his authority in Francia, from which he was frequently absent on visits to the royal court.