The Novallas Bronze may be considered one of the most important epigraphic finds in recent years in Spain. It is a fragment of a public document datable to the last decades of the 1st c. BCE, composed in the Celtiberian language but written in the Latin alphabet. The Novallas Bronze is not only one of the latest inscriptions composed in this language – over half a century later than the famous inscriptions from Contrebia Belaisca – but also the longest Celtiberian document written in the Latin alphabet known thus far. This paper offers a complete publication of this exceptional document, as well as an analysis of the principal developments that the artifact illuminates and the consequent implications for the transformations that the Celtiberian people underwent during the transition from Republic to Empire, with particular focus on the process of Latinization.