Herbert Adams Gibbons,
The Foundation of the Ottoman Empire…
“ Philip had every reason in the world to aid the project of Sigismund. Apart from the fact that his immediate hold over the insane king, Charles VI, would be strengthened by the absence from France of the energetic scions of noble{210} families, who, if successful in the struggle against Bayezid, might push on to the Holy Land and find permanent interests—or a grave—there, Sigismund was well worth cultivating. The elder brother of the king of Hungary, Wenceslaus, was Roman emperor, but insecure in his position. ”
