He studied at his home town (1826–30), in Peretvönyi (1830–31), later attended gymnasium in Krupina and Evangelical lyceums in Banská Štiavnica (Selmecbánya) (1839–40) and Pressburg (Pozsony, present Bratislava) (1840–1842) and finally studied theology at the University of Halle (1843–44).
Afterwards, with his father-in-law's support, he managed to defeat the revolt of Miklós Kőszegi and Matthew III Csák, and occupy the castles of Kőszeg and Pozsony.
When king Ladislaus IV led a campaign against Ivan Kőszegi and captured Kőszeg in 1286, Apor Péc, in alliance with Nicholas Kőszegi, besieged and occupied the castle of Pressburg (Pozsony; today Bratislava, Slovakia), as well as devastated its surrounding area in winter that year.
His other restorations include the town hall of Lőcse (now Levoča, Slovakia) and churches at Ákos (now Acâș in Romania), Karcsa and Pozsony (now Bratislava, Slovakia).
János Gáspár Mertz (Casparus Josephus Mertz) was born in Pozsony, Kingdom of Hungary, now Bratislava (Slovakia).
Eisenstaedter studied at the Mattersdorf yeshiva in Nagymarton, Burgenland under Moses Schreiber, a renowned rabbi who later became the chief rabbi of Pressburg (Pozsony, now Bratislava in Slovakia).
During the coronation of 19 Hungarian kings (1563–1830) in Bratislava (Pressburg), (Pozsony), the ruler would enter with his coronation entourage by the way of the Vydrica Gate, get crowned at St. Martin's Cathedral and one of the stops following the coronation during the procession through the town was the stop at St. Michael's Gate, where the new king would pledge his king's oath to the hands of the archbishop.
In 1819 Nikolaus went to the University of Vienna; he subsequently studied Hungarian law at Pozsony (Bratislava) and then spent the next four years qualifying himself in medicine.
Bratislava (at that time Pozsony / Pressburg) became the capital city of Hungary.
Two railway lines were planned, extending from Vienna to the south and east: one to Wiener Neustadt and Gloggnitz, and one via Bruck an der Leitha to Győr (German: Raab), with an extension to Uj-Szöny (now a suburb of Komárom) and a branch line to Pozsony (now Bratislava).