In this article we carry out a complete análisis about notaries who Works in the town of Murcia in the Late Middle Ages. We study the «escribanos del número» and the royal notaries, appointed by the town council and the monarchy. Inside this group, we approach the notaries related to the collecting of royal taxes (custom-houses) and justice. An exhaustive characterization is accomplished of the members of this profession, their duty, the way of accesing to the post, family ties, social and economic level, etc. We analyze on detail the transmission mode of the post, heritage, exams, peddling of political favours in the council and, finally, conflicts with their fellow neighbours