Originating in 1941 as a State Archive Section, it became one of the State Archives in 1963. The Section had received the archival documents that had been brought together by Ubaldo Pasqui in a single great documentary collection starting in 1885. The most important cores consisted of the Municipal Archives, the archives of numerous juridical bodies and those of the city’s institutions and charity organisations, one of them noteworthy for its scientific interest, a collection of 17 plates relevant to the project for the old Hospital of Santa Maria sopra i Ponti, dating from around the middle of the 18th century. In 1885 Pasqui began the work of rearranging the documents, and still today his inventory constitutes one of the most important tools for consulting the Municipal Archives and the Archives of the Podestà and the Capitano, of the Guilds of Arts and Trades, of the Hospitals and the Ecclesiastical Institutions, as well as various books, fragments and codexes, parchments, notarial acts and, in part, those of the Land Office. New inventories of the judicial archives for the period 1772-1865 have recently been compiled. Most of the documents in the Arezzo archives date from before the second half of the 15th century, the period in which the city of Arezzo was annexed to Florence. In 1960 the judiciary and administrative documentation of the area was included, as well as numerous land office documents and those from private archives. The Arezzo Diplomatic Archive is conserved in the Florence State Archive.