The authors, who were initiated to sigillography by Jean-Claude Cheynet, offer as a tribute to his teaching the edition and commentary of 40 Byzantine lead seals assembled by one of them. Of particular historical importance are a seal of Apsimar, illoustrios and komes, probably mirroring an early stage of the career of the future emperor Tiberios III, a seal of the famous Frankish mercenary Roussel of Bailleul who rebelled against the empire, styling himself proedros and stratopedarches. The commentary includes further seal editions, for instance the bulla of Alexios I’s brother, Nikephoros Komnenos, sebastos and megas droungarios of the Fleet.