Wikipedia:Selected anniversaries/May 20
This is a list of selected May 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. Before doing so, please review the selected anniversaries guidelines. If your suggestion is potentially controversial or relates to a day currently or soon to appear on the Main Page, post it on the talk page instead.
Please note:
- Events listed on the Main Page are selected based on article quality and to provide a diverse range of topics, rather than solely on the importance or significance of the events.
- Only four or five events are featured each day; therefore, not all important or significant events can be included.
- An event is generally excluded if it is already the subject of the scheduled featured article or picture of the day.
To report an error in content currently on the Main Page, see Wikipedia:Main Page/Errors. If a listed event is inaccurate, please first seek consensus and update the corresponding article before making changes here.
May 20: National Day in Cameroon (1972); Independence Day in East Timor (2002)
- 325 – The First Council of Nicaea, the first ecumenical council of the Christian Church, was formally opened in present-day Iznik, Turkey.
- 1293 – Sancho IV, King of Castile and León, established what is now the Complutense University of Madrid, today one of the top public universities in Spain.
- 1570 – The first modern atlas, Theatrum Orbis Terrarum (world map pictured) by cartographer Abraham Ortelius, was issued.
- 1873 – Clothing manufacturer Levi Strauss and tailor Jacob Davis were granted a patent for using copper rivets to strengthen the pockets of denim overalls, paving the way for their business Levi Strauss & Co. to start manufacturing their first line of blue jeans.
- 1927 – By the Treaty of Jeddah, the United Kingdom recognized the sovereignty of King Ibn Saud in the Kingdoms of Hejaz and Nejd, which later merged to become Saudi Arabia.
- 2002 – East Timor became the first new sovereign state of the twenty-first century after Indonesia relinquished control of the territory.