- Pope of the Roman Catholic Church, 1878-1903
- Pope Benedict XVI surpassed his longevity record in 2020, however since Benedict had abdicated several years earlier (him being Pope Emeritus), Leo still holds the record for eldest-reigning Pope (at age 93 years).
- At 25 years, he is the fourth-longest reigned Pope in history.
- He was the first Pope to be captured on film.
- He is the earliest born person on record ever to appear on film.
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