He was a significant medieval ruler who played a crucial role in the expansion and consolidation of the House of Savoy’s influence in the regions that are now part of modern-day France, Italy, and Switzerland.

[1] Following his marriage to Sybille of Bâgé in 1272, Amadeus began life in the service of his cousin, King Edward I of England, as a household knight, serving in the First Welsh War of 1277.

Philip's will charged his niece Eleanor of Provence and her son Edward I of England with the inheritance of Savoy.

He pursued an alliance with the Kingdom of France and received Maulévrier in Normandy as a result of initial good relations.

The eventual recovery of Lyon by the kings of France alerted Amadeus to their expansionistic tendencies towards the regions by the Alps.

He sought a powerful ally against potential hostility in the German king Henry VII, who was married to Margaret of Brabant, the sister-in-law of Amadeus.