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In page Hugh Capet:

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This manoeuvre allowed Hugh to become the most powerful person in France in the first half of the tenth century. Once in power, Louis IV granted him the title of dux Francorum ("Duke of the Franks"). Louis also (perhaps under pressure)[citation needed] officially declared Hugh "the second after us in all our kingdoms". Hugh also gained power when Herbert II of Vermandois died in 943, because Herbert's powerful principality was then divided among his four sons.[citation needed]