Gregory the Great Gregorian chant had almost nothing to do with Gregory.

他称为格里高利教皇格里高利圣歌其实与他完全无关。

St Augustine of Canterbury was sent by Pope Gregory the Great in Rome and that church used the Roman Calendar, so western countries celebrate Christmas on the 25th December.

坎特伯雷的圣奥古斯丁是罗马教皇格雷戈里大帝派遣到罗马的， 那个教堂使用的是罗马历， 所以西方国家在12月25日庆祝圣诞节。