Laura M'Cracken, Gubbio Past and Present.
[20] Dante, Inferno, v. 118.
[21] Gregorovius, Rome in the Middle Ages.
[22] Their identity is disputed.
[23] Dante, Purgatory, xxviii. 40.
[24] Dante, Inferno, iv. 6.
[25] 'The energetic Lambert had made a genuine peace with Rome, where he had gloriously restored the Imperial power. The Pope, though compelled by necessity, had with equal sincerity striven to secure Lambert in the Imperium. Freed from all foreign influence, it seemed now for the first time possible to form an independent kingdom within the Italian frontier.'—Gregorovius, Rome in the Middle Ages.
[26] 'This waterfall is in its present form wholly artificial. It was first formed by M'. Curius Dentatus, who opened an artificial channel for the waters of the Velinus, and thus carried off a considerable portion of the Lacus Velinus, which previously occupied a great part of the valley below Reate.'—Dictionary of Greek and Roman Geography.
[27] Purgatory, Canto xxiii., Cary's Translation.
[28] J. A. Symonds, Italian Studies.