Year 1543 (MDXLIII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. It is one of the years sometimes referred to as an "Annus mirabilis" because of its significant publications in science, considered the start of the scientific revolution. Events January–June February 11 – King Henry VIII of England allies with Charles V, Holy Roman Emperor, against France. February 21 – Battle of Wayna Daga: A joint Ethiopian-Portuguese force of 8,500, under Emperor Gelawdewos of Ethiopia, defeats Imam Ahmad ibn Ibrahim al-Ghazi's army of over 14,000, ending the Ethiopian–Adal war. March King Gustav Vasa's troops crush the forces of Swedish peasant rebel Nils Dacke in battle, ending the uprising. Dacke escapes, but is captured and killed in the summer. Consolidating Act of Welsh Union: The Parliament of England establishes counties and regularises parliamentary representation in Wales. April – Campaign of Suleiman: Suleiman the Magnificent, Ottoman Sultan, revives the Little War in Hungary. May – Nicolaus Copernicus publishes De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres) in Nuremberg, offering mathematical arguments for the existence of the heliocentric universe, denying the geocentric model. Copernicus dies on May 24 in Frombork, at the age of 70. June – Andreas Vesalius publishes De humani corporis fabrica (On the Fabric of the Human Body), revolutionising the science of human anatomy. July–December July 1 – The Treaty of Greenwich is signed between England and Scotland (repudiated by Scotland December 11). July 12 – King Henry VIII of England marries Catherine Parr. It is the sixth and last of Henry's marriages and the third of Catherine's. Princess Elizabeth attends the wedding. This month, the Parliament of England passes the Third Succession Act, restoring the Princesses Mary and Elizabeth I of England, Henry's daughters, to the line of succession to the English throne. July 25 – August 10 – Siege of Esztergom: Suleiman the Magnificent, Ottoman Sultan, besieges and takes Esztergom in Hungary. August 6–22 – Siege of Nice: Ottoman Empire and French forces (under the Franco-Ottoman alliance), led by Admiral Hayreddin Barbarossa, besiege and take Nice. August 25 – Led by the Chinese pirate Wang Zhi, the first Europeans and firearms arrive in Japan in Tanegashima island in southern Kyushu including Portuguese traders António Mota, António Peixoto, Francisco Zeimoto, and presumably Fernão Mendes Pinto. September – October – Landrecies in Picardy is besieged by forces under