Around Nicomachus, the alleged son of a public slave, who became the collector and transcriber of the city’s laws, a group of men in the service of Athenian institutions takes shape. Radically distinct from that of the magistrates, their activity was well and truly outside the political field, as described in Plato’s Statesman. It brought together slaves and free men, whether they played the role of assistant to the archons or of undersecretaries to certain magistrates. Reading the prytany inscriptions suggests that, within it, the distinction between free men and slaves prevented the formation of a collective identity based on a specific skill and professional dignity. The chorus of bureaucrats that surrounds Nicomachus, in short, is only a mirage. Trapped by the city’s self-representation, such a reading would, however, be erroneous. It undoubtedly underestimates the existence of an administrative culture of which these men, whether they were free or slaves, could be the guardians, and about which our sources are admittedly tenuous. Above all, it ignores the opportunities public slaves were given to accede, if not during their lifetime, then possibly via the intermediary of descent, to the society of free men. Nicomachus, after all, was perhaps the son of a dēmosios, and, if this was the case, it allows us to suggest, on the one hand, that service to the city could lead some of these slaves to see their descendants acquire citizenship and, on the other hand, that citizenship could be acquired through the transmission of professional skills from father to son, which were put to service for the common good. Therefore, it is perhaps through the transmission, over several generations, of a skill used in the service of Athens that the chorus of the bureaucrats of the city came into being, which transcended the distinction between free men and slaves.