On July the 11th 1419, the Community of Cividale signed a pact of friendship with Venice, often mistankenly considered to be part of the numerous "deditiones" (pacts of willing subordination) that were signed between the Serenissima and several cities of Friuli. This paper aims to discuss and emphasize the importance of the deal between Cividale and Venice for the construction of the Venetian Mainland State.