“And Isaiah the prophet cried unto the Lord; and he brought the shadow ten degrees backward, by which it had gone down in the dial of Ahaz.”

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Constantine, who transferred the seat of empire, the Roman laws, and the Roman standard to Byzantium, thus in a poetic sense becoming a Greek. ↩

This refers to the supposed gift of Constantine to Pope Sylvester, known in ecclesiastical history as the patrimony of Saint Peter. Inferno XXI 115:⁠—