1378—The Great Schism.
1388—Urban VI sends two armed galleys for the defence of Constantinople, but is unsuccessful in raising crusade.
1391—Boniface IX stirs up trouble between Latin and Greek Christians in the Balkan peninsula.
1398 and 1399—Boniface IX orders crusade to be preached throughout Christendom for the defence of Constantinople.
1399—Boucicaut, the only one to respond, goes to the aid of Constantinople.
1402—Smyrna is lost to Timur.
1403—The strife between rival Popes, Benedict XIII and Boniface IX, makes impossible a papal effort to take advantage of the civil strife between the sons of Bayezid, after Timur’s abandonment of his conquests in Asia Minor.