Eisenstadt (Hungarian: Kismarton, Croatian: Željezni grad, Željezno, Slovene: Železno) is a city in Austria, the state capital of Burgenland. It has a population of about 13,165 (2012). In the Habsburg monarchy, Kismarton (Eisenstadt) was the seat of the Eszterházy Hungarian noble family. The composer Joseph Haydn lived there as Hofkapellmeister under Esterházy patronage.