Stephen Báthory, king of Poland and Hungary
1533 - 1586

Stephanus Bathor, King of Poland and Grand Duke of Lithuania, Duke of Prussia, Mazovia (Poland), etc.

What Wikipedia says :

Stephen Báthory 27 September 1533 – 12 December 1586) was King of Poland and Grand Duke of Lithuania as well as Prince of Transylvania (1576–1586), after previously being Voivode of Transylvania (1571–1576).

The son of Stephen VIII Báthory and a member of the Hungarian Báthory noble family, Báthory was a ruler of Transylvania in the 1570s, defeating another challenger for that title, Gáspár Bekes.

In 1576, Báthory became the husband of Queen Anna Jagiellon and the third elected king of Poland. He worked closely with chancellor Jan Zamoyski. The first years of his reign were focused on establishing power, defeating a fellow claimant to the throne, Maximilian II, Holy Roman Emperor, and quelling rebellions, most notably, the Gdańsk rebellion.

He reigned only a decade, but is considered one of the most successful kings in Polish and Lithuanian history, particularly in the military realm. His signal achievement was his victorious campaign in Livonia against Russia in the middle part of his reign, in which he repulsed a Russian invasion of Commonwealth borderlands and secured a highly favorable treaty of peace (the Peace of Jam Zapolski).

Continued on Wikipedia

Text below taken from Louis Moreri's Grand Dictionnaire Historique, 1725
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BATHORI, a noble family from Transylvania, which produced several princes for that state.

Etienne (Stephen ) Bathori was elected in 1571 after the death of John Sigismund and was approved by Maximilian and Selim, the former being the German emperor and the latter the Turkish sultan. He was then placed on the Polish throne, which Henry III had just vacated, made great progress against the Muscovites, and died in 1586.

The above text was processed by the DEEPL machine translation programme.