Halloween - All Hallows' Day was officially switched to 1 November

Time: Thursday Nov 1, 835

Place: Vatican City (then Rome, Roman Empire)

Details: In 835, All Hallows' Day was officially switched to 1 November, the same date as Samhain, at the behest of Pope Gregory IV.

Related

Near

Halloween-Pope Gregory III

731 - Vatican City (then Rome, Roman Empire)

Halloween-Lemuria

609 - Vatican City (then Rome, Roman Empire)

Crusades-Eugene III recently elected pope

Saturday Dec 1, 1145 - Vatican City

Pope Francis-First Consistory

Thursday Aug 29, 2019 at 03:11:00 PM - Vatican City

Galileo Galilei-Pope Benedict XIV authorized the publication of an edition of Galileo's complete scientific works which included a mildly censored version of the Dialogue

1741 - Rome, Italy (Now Vatican City)

On This Day - 1 November

Disasters with highest death tolls-1755 Lisbon Earthquake

Saturday Nov 1, 1755 at 09:40:00 PM - Lisbon, Portugal

David Copperfield-The 64 chapters have all been published

Friday Nov 1, 1850 - England, United Kingdom

Xinhai Revolution-Appointing Yuan Shikai as The Prime Minister of The Imperial Cabinet

Wednesday Nov 1, 1911 - China

Irish War of Independence-Twenty-four men were executed by the British

Monday Nov 1, 1920 - Ireland

Ottoman Empire-Sultanate was abolished

Wednesday Nov 1, 1922 - Ottoman Empire