Wikipedia:Selected anniversaries/June 15
This is a list of selected June 15 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 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.
- 1219 – Northern Crusades: According to a popular Danish legend, the Dannebrog (Flag of Denmark), today one of the oldest state flags in the world still in use, fell from the sky and gave the Danish forces renewed hope to defeat the Estonians at the Battle of Lyndanisse.
- 1667 – French physician Jean-Baptiste Denys administered the first fully-documented human blood transfusion, giving the blood of a sheep to a 15-year old boy.
- 1846 – To settle the Oregon boundary dispute, the United Kingdom and the United States signed the Oregon Treaty, extending the United States – British North America border west along the 49th parallel north that was first established by the Treaty of 1818.
- 1978 – King Hussein of Jordan married American Lisa Halaby (pictured), who is since then known as Queen Noor of Jordan.
- 2001 – Leaders of the People's Republic of China, Russia, Kazakhstan, Kyrgyzstan, Tajikistan and Uzbekistan formed the Shanghai Cooperation Organisation.