Born on the 7^th of December, 1812, in Słowiki, a grange of Giełgudyszki Niższe on the East Prussian border. He attended schools in Samogitia and the Augustów District before studying law at the Warsaw University. He took part in the November Uprising as a volunteer, enrolling to the regular insurgent forces. Seriously wounded in one of the skirmishes, he barely saved his neck. After the fall of the uprising Kajsiewicz travelled through Germany to France where he met, among others, Jan Koźmian, Adam Mickiewicz, Piotr Semenenko, and Bohdan Jański. In 1836 he entered a seminary in Paris and, after a year, went to study theology in Rome. He was ordained priest in 1841 and, in the following year, together with Semenenko, he founded the Congregation of the Resurrection of Our Lord Jesus Christ. Having returned to France, he took up formation work according to the spirit of Catholicism in the circles of Polish emigration. At that time, mystical doctrines disseminated by Towiański were in vogue in those environments, which Kajsiewicz regarded as extremely dangerous. With his sermons, he quickly won the fame of an eminent preacher, although their anti-revolutionary purport meant that their author met with hostility of certain emigration circles and some environments in Poland, too. In the mid-1840’s Kajsiewicz moved to Rome again, and towards the end of that decade he travelled through England, Germany, and Galicia. In 1855 he was elected the Superior General of the Congregation of the Resurrection of Our Lord Jesus Christ. The last years of his life Kajsiewicz spent travelling to places such as Bulgaria, America, and Syria; he stayed in Galicia, too, but was mostly occupied with the affairs of his Congregation in Italy. He died in Rome on the 26^th of February, 1873. His most important works are the sermons, such as, for instance, O rządach Opatrzności, O pokucie, O trojakim życiu i trojakim patriotyzmie, O cudownym rozszerzaniu się i trwaniu wiary Chrystusowej z powodu ostatnich walk Kościoła katolickiego w Polsce, O ważności męczeństwa, O jedności z miłości bożej, O postępie religijnym, as well as the List otwarty do braci księży grzesznie spiskujących i do braci szlachty nie mądrze umiarkowanych.