Inter gravissimas

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What Wikipedia says

Inter gravissimas (English: "Among the most serious...") was a papal bull issued by Pope Gregory XIII on 24 February 1582. The document, written in Latin, reformed the Julian calendar.

Excerpt from the Wikipedia article “Inter gravissimas”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Gregory XIII, Public domain, via Wikimedia Commons.