SEMLIN (Hungarian, Zimony; Servian, Zemun)  , a town of Croatia-Slavonia, in the county of Syrmia, situated beside the south bank of the Danube, on a tongue of land between that river and the Save . Pop . (1goo) about 15,079; the majority being Serbs, the remainder Croats, Jews, Germans, Magyars and Gipsies . Semlin is the seat of an Orthodox archbishop; but most of the inhabitants are Roman Catholic . Apart from numerous churches, its chief buildings are the law-courts, prison, theatre, synagogue, a higher grade school or real-gymnasium, and two technical schools, one being for girls . Much of the town is modern, but its suburb Franzenthal near the Danube consists partly of mud huts thatched with reeds . Standing at the confluence of two navigable rivers, and on the main line from Buda-Pest to Constantinople and Salonica, Semlin is the principal customs and quarantine station for travellers between Austria-Hungary and the Balkan states . It communicates with Vienna and the Black Sea, by the Danube; with Sissek, by the Save; and with Belgrade by a steam-ferry and a bridge over the Save . There are a few factories, but far more important is the transit trade in grain, fruit, livestock and timber . Various Roman remains have been discovered near Semlin . On the top of Zigeunerberg, a hill overlooking the Danube, are the ruins of the castle of Hunyadi Janos, who died here in 1456 . Until 1881 the town belonged to the Military frontier (q.v.) .