Grand Duchy of Lithuania | Duchy of Brabant | Duchy of Saxony | Duchy of Carinthia | Duchy of Burgundy | Duchy of Cornwall | Grand Duchy of Hesse | Grand Duchy of Mecklenburg-Schwerin | Duchy of Parma | Chancellor of the Duchy of Lancaster | Duchy of Warsaw | Duchy of Prussia | Duchy of Jülich | Lorraine (duchy) | Grand Duchy of Baden | Duchy of Milan | Duchy of Mecklenburg-Schwerin | Duchy of Lancaster | Duchy of Holstein | Sorrento | Duchy of Savoy | Duchy of Nassau | Duchy of Limburg | Duchy of Württemberg | Duchy of Pomerania | Duchy of Luxembourg | Grand Duchy of Oldenburg | Duchy of Spoleto | Duchy of Mecklenburg-Strelitz | Grand Duchy of Tuscany |
The Pactum Sicardi was a treaty signed on 4 July 836 between the Greek Duchy of Naples, including its satellite city-states of Sorrento and Amalfi, represented by Bishop John IV and Duke Andrew II, and the Lombard Prince of Benevento, Sicard.