Wikipedia:Selected anniversaries/January 20

This is a list of selected January 20 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Please read the selected anniversaries guidelines before making your edit. However, if your addition might be controversial or on a day that is or will soon be on the Main Page, please post your suggestion on the talk page instead.

Please note that the events listed on the Main Page are chosen based more on relative article quality and to maintain a mix of topics, not based solely on how important or significant their subjects are. Only four to five events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is generally not posted this year if it is also the subject of the scheduled featured article, featured list or picture of the day.

To report an error when this appears on the Main Page, see Main Page errors. Please remember that this list defers to the supporting articles, so it is best to achieve consensus and make any necessary changes there first.

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January 20

• 250 – Pope Fabian (pictured) became one of the first people to die during Roman Emperor Decius' widespread persecution of Christians.

• 1576 – León in Guanajuato, Mexico, was founded by order of Viceroy Martín Enríquez de Almanza of New Spain.

• 1839 – Chilean troops decisively defeated the forces of the Peru-Bolivian Confederation at the Battle of Yungay in the Ancash Region of Peru, effectively ending the War of the Confederation.

• 1840 – William II became King of the Netherlands after his father William I abdicated the throne.

• 1942 – The Holocaust: SS-Obergruppenführer Reinhard Heydrich and other senior Nazi German officials met at the Wannsee Conference in the Berlin suburb of Wannsee to discuss implementing of the "Final Solution to the Jewish Question".

• 1990 – The Soviet Red Army violently cracked down on Azeri pro-independence demonstrations in Baku, Azerbaijan SSR.

More anniversaries:

• January 19
• January 20
• January 21