John III Sobieski, Polish-Lithuanian king (d. 1696)
John III Sobieski (Polish: Jan III Sobieski; Lithuanian: Jonas III Sobieskis; Latin: Ioannes III Sobiscius; 17 August 1629 – 17 June 1696) was King of Poland and Grand Duke of Lithuania from 1674 until his death.

Born into Polish nobility, Sobieski was educated at the Jagiellonian University and toured Europe in his youth. As a soldier and later commander, he fought in the Khmelnytsky Uprising, the Russo-Polish War and during the Swedish invasion known as the Deluge. Sobieski demonstrated his military prowess during the war against the Ottoman Empire and established himself as a leading figure in Poland and Lithuania. In 1674, he was elected monarch of the Polish–Lithuanian Commonwealth following the sudden and unexpected death of King Michael.

Sobieski's 22-year reign marked a period of the Commonwealth's stabilization, much needed after the turmoil of previous conflicts. Popular among his subjects, he was an able military leader, most famous for his victory over the Turks at the Battle of Vienna in 1683. The defeated Ottomans named Sobieski the "Lion of Lechistan", and the Pope hailed him as the saviour of Western Christendom. Suffering from poor health and obesity in later life, Sobieski died in 1696 and was buried at Wawel Cathedral in Kraków. He was succeeded by Augustus II of Poland and Saxony.