 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.Amadeus accompanied Henry in his Italian campaign of 1310 – 1313, which culminated in Henry's coronation as Holy Roman Emperor on 29 June 1312.