Esztergom is the seat of the Roman Catholic Primate of Hungary. The Cathedral is the largest church in the country. Rebuilt in the 19th century in classical style, it has the largest altar-piece in the World painted on a single piece of canvas. The famous Bakócz Chapel was built of red marble at the beginning of the 16th century. The Cathedral Treasury holds the richest collection of Hungarian ecclesiastical treasures. The Romanesque Royal Palace with the royal oratory, the frescoed castle chapel and the rose-window are in the neighbourhood of the Basilica. The Christian Museum is located in the Primate's Palace. Treasures of medieval Hungarian art and early Renaissance Italian paintings are preserved here.