A pope with this name had heralds yell "I am caesar!
A pope with this name allegedly used a hidden speaking tube to torment his predecessor, a peasant who once tried to hang his hat on a sunbeam. Palestrina was razed and sown with salt by a pope of this name as part of his war with the Colonna family. A pope with this name had heralds yell "I am caesar! I am the emperor!" during the firstÂ­ever papal jubilee. That pope with this name decried taxation of clergy in (*) Clericis Laicos and died shortly after Guillaume de Nogaret slapped him at Anagni. After that pope with this name asserted papal supremacy in Unam Sanctum, a king known as "the fair" had him imprisoned and replaced with Clement V, thus beginning the Babylonian Captivity. For 10 points, give this papal name, whose eighth holder feuded with Philip IV and Dante.
A pope with this name allegedly used a hidden speaking tube to torment his predecessor, a peasant who once tried to hang his hat on a sunbeam.
Boniface  VIII [do not accept any other numbers, since all the clues are about Boniface VIII]