Placitum of Riziano

The Placitum of Riziano was a dispute that took place c. 804 around the Rizano River, probably at Rižana in modern Slovenia. The document is important for the history of Koper and Trieste because it is the first written evidence of the presence of a Slavic-speaking population in Istria close to Trieste.
Legates sent by Charlemagne heard complaints by the leaders of Istria about the bishops and the John, Duke of Istria. The document is believed to have been recorded on the orders of Fortunatus II, patriarch of Grado. A point of historiographical contention is the fact that only the leaders of the coastal towns of Istria were present; one explanation for this is that the issues being discussed only affected the coast.
The Latin text has been edited many times, but the standard edition is by Manaresi. The text has been translated into various modern languages.