The Green Book of Barcelona is a 14th-century handwritten codex that compiles the privileges that governed municipal life in the Catalan capital in the Middle Ages. It has great symbolic value, but also aesthetic value due to the miniatures and headers scattered throughout its pages. The entire medieval society is represented in four volumes. Written in Latin and Catalan, it is kept locked in the Municipal Historical Archive of Barcelona and, in the last 50 years, has only been released twice: in 1979, when Narcís Serra was sworn in as the first democratic mayor after the dictatorship, and in 1999, at the exhibition Gothic Barcelona which was held at the Barcelona History Museum. Not even Xavier Trias managed to retrieve it from the archive in 2011 when he was sworn in as mayor and asked for it. For the first time this century, and for just one week, it will be shown in the exhibition. Barcelona: The Archive that we are, which can be seen from September 19 to November 23 at the Museu d'Història de Barcelona.