The Lordship and later Principality of Piedmont (Italian: Piemonte, French: Piémont) was originally a appanage of the Savoyard county and as such its lords were members of the Savoy-Achaea branch of that illustrious house. The title was inherited by the elder branch of the dynasty in 1418, at about which time Savoy was elevated to ducal status and Piedmont to princely status. The system of appanage has greatly influenced the territorial construction of France and explains the flag of many provinces of France. ... The House of Savoy or in Italian, La Casa di Savoia, or simply Casa Savoia, (or Savoie, French) is a dynasty of nobles who traditionally had their domain in Savoy, a region that includes present-day Piemonte, other parts of Northern Italy, and a smaller region in France. ... The Principality of Achaea was one of the three vassal states of the Latin Empire which replaced the Byzantine Empire after the capture of Constantinople during the Fourth Crusade. ... Events May 19 - Capture of Paris by John, Duke of Burgundy September - Beginning of English Siege of Rouen Mircea the Old, ruler of Wallachia dies and is succeeded by Vlad I Uzurpatorul. ...