How did Charlemagne build his legend? What were the limits of his vast empire? Why did he make Aachen his capital? To talk about it, Stéphane Bern receives Bruno Dumézil, historian of the early Middle Ages, professor of medieval history at Sorbonne University and author of the biography "Charlemagne" (PUF). Historically Yours is produced by Loic Vimard, Benjamin Delsol, Tony Liégois and Armelle Thiberge.