Stephen Báthory
Policies

After securing control over the Commonwealth, Báthory had a chance to devote himself to strengthening his authority, in which he was supported by his chancellor Jan Zamoyski, who would soon become one of the king's most trusted advisers. Báthory reorganised the judiciary by the formation of legal tribunals (the Crown Tribunal in 1578 and the Lithuanian Tribunal in 1581). While this somewhat weakened the royal position, it was of little concern to Báthory, as the loss of power was not significant in the short term, and he was more concerned with the hereditary Hungarian throne. In exchange, the Sejm allowed him to raise taxes and push a number of reforms strengthening the military, including the establishment of the piechota wybraniecka, an infantry formation composed of peasants. Many of his projects aimed to modernize the Commonwealth army, reforming it in a model of Hungarian troops of Transylvania. He also founded the Academy of Vilnius, the third university in the Commonwealth, transforming what had been a Jesuit college into a major university. He founded several other Jesuit colleges, and was active in propagating Catholicism, while at the same time being respectful of the Commonwealth policy of religious tolerance, issuing a number of decrees offering protection to Polish Jews, and denouncing any religious violence.

In external relations, Báthory sought peace through strong alliances. Though remaining distrustful of the Habsburgs, he maintained the tradition of good relations that the Commonwealth enjoyed with its Western neighbor and confirmed past treaties between the Commonwealth and Holy Roman Empire with diplomatic missions received by Maximilian's successor, Rudolf II. The troublesome south-eastern border with the Ottoman Empire was temporarily quelled by truces signed in July 1577 and April 1579. The Sejm of January 1578 gathered in Warsaw was persuaded to grant Báthory subsidies for the inevitable war against Muscovy.

A number of his trusted advisers were Hungarian, and he remained interested in Hungarian politics. In his last years, Báthory, with Pope Gregory XVIII 's approval, made a plan with Antonio Possevino for the liberation of Ottoman Hungary by a well organized (mostly Polish) Christian army, and the creation of a strong and independent Hungarian-Polish union under his rule. However, the unfavorable international situation did not allow him significantly to advance any of his plans in that area. In addition to Hungarian, he was well versed in Latin, and spoke Italian and German; he never learned the Polish language.

In his personal life, he was described as rather frugal in his personal expenditures, with hunting and reading as his favorite pastimes.
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