Year 1552 (MDLII) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar. Events January–June January 15 – Henry II of France and Maurice, Elector of Saxony, sign the Treaty of Chambord. February 12 – Pedro de Valdivia founds the Chilean city of Valdivia, as Santa María la Blanca de Valdivia. February 24 – The privileges of the Hanseatic League are abolished in England. March – The Act of Uniformity imposes the Protestant Book of Common Prayer on England. March 26 – Guru Amar Das becomes the Third Sikh Guru. April – War breaks out between Henry II of France and Emperor Charles V. Henry invades the Duchy of Lorraine, and captures Toul, Metz and Verdun. April 11 – Metz Cathedral is consecrated. April 16 – Pedro de Valdivia founds the city of La Imperial, Chile. May – Maurice, Elector of Saxony, captures Augsburg, and almost seizes Charles V, Holy Roman Emperor at Innsbruck, leading to the suspension of the Council of Trent. July–December July 6–July 9 – In Hungary, Drégely Castle is attacked by the Ottoman Empire. Captain György Szondy and c. 140 soldiers in the castle die, after 4 days of fighting against 8,000 Turkish raiders. August 2 John Frederick, Elector of Saxony and Philipp I of Hesse, taken prisoner by Charles V in 1546, are released. The Peace of Passau revokes the Augsburg Interim of 1548, and promises religious freedom to the Protestant princes. September – In Hungary, captain István Dobó commands the breaking of the Siege of Eger, led by Kara Ahmed Pasha of the Ottoman Empire. September 24 – The Debatable Lands on the border of England and Scotland are divided between the two kingdoms by a commission creating the Scots' Dike in an unsuccessful attempt to halt lawlessness here, but giving both countries their modern borders. October 2 – The Khanate of Kazan falls to troops of Ivan IV of Russia. Date unknown In the Persian Gulf, the Ottoman Empire Red Sea Fleet attacks the Portuguese stronghold of Hormuz, but fails to capture it. The Ottoman's capture the city of Temesvar. In Italy, Bartolomeo Eustachi completes his Tabulae anatomicae, presenting his discoveries on the structure of the inner ear and heart, although, for fear of the Inquisition, it will not be published until 1714. King Edward VI of England founds 35 grammar schools by royal charter, including