EISENSTADT, or Kis-Marton, a royal free town of East Hungary, in the vârmegye or county of Sopron or Oedenburg,in 47° 5ΓN. lat. and 16° 30'E. long.,is situated at the foot of the Leitha mountain range,not far from the west bank of Lake Neusiedl, 26 miles S.E. of Vienna. The town is famous as being the seat of Prince Eszterhâzy, whose castle of Kis-Marton is one of the finest palaces in Hungary. It was built by Prince Paul, palatine of Hungary, in 1683, but was improved and added to in 1805. The park, which is very large, has a fiue orangery, and several conservatories, containing many thousand varieties of exotic plants. The town itself is walled round, and has three main streets, with an old church, a town-hall, hospitals, and monasteries of the Brothers of Charity and of the Franciscans. To the north of the town there are extensive zoological gardens. The population in 1870 amounted to 2476.