One story about Giotto tells how he sent Pope Boniface VIII a perfect circle painted with a single brushstroke when asked for samples of his work. The Pope was apparently very impressed.

有一个故事说教皇波尼法爵八世曾向乔托索要创作样本，乔托只用了简单的一笔就画了个完美的圆，然后将圆送给他，这件事给教皇留下了深刻的印象。

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He almost succeeded in arresting Pope Boniface VIII at Anagni, and his sons domesticated Boniface's successors at Avignon.

ECONOMIST: Medieval history

Ten days later, his chief lawyer and likely author of the new papal bull permitting resignation, Benedetto Gaitani, became Pope Boniface VIII.

CNN: Echoes of past in pope's resignation