House of Visconti
In 1349, Amadeus agreed to a treaty between himself, Amadeus of Geneva, James of Piedmont, and the House of Visconti, rulers of Milan, for mutual defence and assistance. This treaty included provisions for Galeazzo II Visconti to marry Bianca of Savoy, sister of the count. To honor the marriage in 1350, Amadeus created the Order of the Black Swan.