The Reformed Great Church or Great Reformed Church in Debrecen (Hungarian: debreceni református nagytemplom) is located in the city of Debrecen. It stands in the city centre, between Kossuth square and Kálvin square. It is the symbol of the Protestant Church in Hungary, and it is because of this church that Debrecen is sometimes referred to as "the Calvinist Rome". With a ground space of 1500 m² it is the largest Protestant church in Hungary. It also has the largest bell of all Hungarian Protestant churches. The Great Church was built between 1805 and 1824 in the neoclassical style.
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