Herbert Adams Gibbons,
The Foundation of the Ottoman Empire…
“ The great schism in the Western Church, which so aided Murad and Bayezid in laying solidly the foundations of an empire in Europe, was the outcome of the short-sighted and purely selfish policy of these two popes. How far from the truth it is to represent them as courageously, whole-heartedly, and persistently endeavouring to awaken the interest and attention of Europe in the peril from the East! ”
