Zygmunt Erazm Gaspar Józef Sierakowski (Belarusian: Зігмунт Ігнатавіч Серакоўскі, Lithuanian: Zigmantas Sierakauskas; 19 May 1826, Lisów [pl]– 27 June 1863, Vilnius) was a Polish[1] leader of the January Uprising in lands of the former Grand Duchy of Lithuania in the Polish–Lithuanian Commonwealth.

His mother dressed him as a girl, wanting to avoid him being drafted into the Cantonist Battalion as a son of a rebel.

As well as his uncles veterans of the November Uprising Felicjan Koszkowski and Kajetan Celermanth, the latter of whom was a member of Szymon Konarski's conspiracy, and took care of Zygmunt and his mother.

During his studies, he was in contact with a secret patriotic and democratic circle associated with the Union of Polish Youth in Vilnius.

[4] In Orenburg he made contact by letter with Ukrainian poet Taras Shevchenko, but only met him in person in St.

[4] In St. Petersburg, he came into contact with the Russian left, most notably Nikolay Chernyshevsky, in whose magazine Sovremennik he took over the foreign chronicle section.

At the General Staff Academy, he founded an underground anti-Tsarist Polish-Russian circle, the leadership of which he soon handed over to Jarosław Dąbrowski.

[4] On behalf of the Ministry of War, he took steps to abolish corporal punishment in the army, and to this end, in May 1860, he traveled abroad, to London, Paris, Turin, Berlin and Vienna, to familiarize himself with the legislation of European countries.

Of the Poles, he saw Joachim Lelewel, Ludwik Mierosławski, Józef Bohdan Zaleski, Seweryn Goszczyński.

In February, a representative of the Reds, Jan Koziełł-Poklewski [pl], came to him with a call to arms or, according to him, only a request for staff maps.

Only after a visit from a representative of the Whites and the Administrative Department of the Provinces of Lithuania (Polish: Administrative Department of the Provinces of Lithuania) Aleksander Oskierka [pl] did Sierakovsky take leave and legally leave St. Petersburg on March 9, 1863.

On April 15, he left for Kaunas, and two days later took command of the troops of Bolesław Kołyszko and Antanas Mackevičius; his forces numbered 400-500 men.

In order to save the uprising, he attempted to stir up the Samogitian and Latvian peasants, and planned to make contact with the Russian "Zemlya i volya" and strike toward Courland and Dünaburg.

[4] His body was secretly buried on Gediminas' Hill (his remains were found and researched in 2017, and honorably reburied in the Rasos Cemetery Chapel on November 22, 2019).