The lex Irnitana consists of fragments of Roman municipal laws dated to AD 91 which had been inscribed on a collection of six bronze tablets found in 1981 near El Saucejo, Spain.
[4] The tablets measure 57.5 by 91.5 cm (22.6 by 36.0 in)[1] and each has three holes at the top and bottom to fix them to the facade of an official building at a height where it could easily be read, as expressly required by article 95.
Correlating the Lex Irnitana with other finds, it is possible to reconstruct most of the original numbering except for twelve sections at the end of tablet V.[2] The letter which is included at the end provides two dates for the text: Litterae datae IIII idus Apriles Circeis recitatae V idus Domitianas, which dates the letter to the 10th of April and its (public) reading to the 11th of the month Domitian (October)[2] both in the year that Manius Acilius Glabrio and Marcus Ulpius Traianus were consuls (AD 91) and is consistent with the granting of Latin Rights to Baetica in 73/74[5] and the original text of the document must have been composed somewhere in between using fragments of existing provisions in older laws from Augustean and even Republican times.
[5] The document contains the municipal regulations of the Hispano-Roman city of Irni and is signed by Emperor Domitian in Circei (Italy) in the year 91.
The text deals with the competencies of duumviri, aediles and quaestores, regulates the decurional order, manumission and the appointment of guardians, the relations between patronus and cliens, the acquisition of Roman civil rights by magistrates and public affairs, including the funding of cults, priesthoods, rituals, calendar and games, which were considered a religious matter.
[1] The text of the law was standard for all cities that held the rank of a municipality; only the name was changed when it was inscribed on bronze tablets for public display.