Hieronim Ossoliński

Hieronim Ossoliński
Coat of arms	Topór
Spouse(s)	Katarzyna Zborowska
Noble family	Ossolinski
Father	Paweł Ossoliński
Mother	Zbigniewa Słupecka
Born	Unknown
Died	1575 or 1576
Buried	Goźlice, Poland
Occupation	Kasztelan of Sandomierz and Wojnicz

Hieronim Ossoliński, (born ? – died 1575 or 1576), coat of arms Topór, was a Polish statesman, kasztelan of Sandomierz and Wojnicz, a delegate to the Sejm of 1569 and one of the signatories of the Union of Lublin, which formally united Poland and Lithuania into the Polish-Lithuanian Commonwealth. Ossoliński was a Calvinist, and a leader of Protestants in the province of Małopolska during the reign of king Zygmunt August. Ossoliński was also one of the leaders of the Executionist movement, which sought to reform 16th century Polish politics.

In his youth, Hieronim was sent by his family to study abroad. During this time, most likely in Germany, he became familiar with Calvinism, converted, and would remain a faithful adherent and advocate for Protestantism throughout his life. He also served under Gian Giacomo Medici in Italy and participated in the taking of Siena.

Ossoliński was one of the leaders of the Executionist movement, which sought to reform 16th century Polish politics. As an "Executionist", Ossoliński promoted the return of state lands illegally seized by some magnates back to the crown, an increase in the powers of the lesser and medium nobility (szlachta), a curtailment of the rights of the Catholic clergy, enforcement of separation of powers in regard to the holding of public offices, religious tolerance, and reform of public finances.

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