Pope Gregory III designated November 1st as All Saints' Day, a time to honor saints and martyrs.

教皇格里高利三世将11月1日定为万圣节，以此纪念圣人和殉道者。

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The solar calendar in use throughout most of the world, sponsored by Pope Gregory XIII in 1582 as a corrected version of the Julian calendar. See table at calendar.

格列高利历，公历：世界绝大部分通用的阳历，由教皇格列高利十三世于1582年倡导使用，为朱利安历法的改进版。

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For example, Pope Gregory the Sixteenth established the Vatican Egyptian Museum in eighteen thirty-nine.

VOA: special.2010.02.03

Pope Gregory the Sixteenth established the Etruscan Museum in eighteen thirty-seven.

VOA: special.2010.02.03

Pope Gregory, recognized as the legitimate pope by the church, became a bishop and retired.

WSJ: When Last Pope Retired, Church Was in Turmoil

Pope Gregory XII - who reigned from 1406 to 1415 - did so to end what was called the Western Schism.

BBC: How does a Pope resign from office?

Some of Pope Gregory's contemporaries were put out because the new calculations were inspired by the accurate planetary readings of Arab astronomers.

ECONOMIST: Late for the date