Great Reformed Church of Debrecen is the main attraction of the city and striking architectural monument in the number of buildings in the classical style of Hungary. The Church was designed by architect Mihai Oven and built in 1805-1822 years. The length of the transverse nave (with the two bodies facing each other and with the pulpit in the Northern part) is 38 m long and 14 m wide, from East to West and 55 m long and 15 m wide. The towers height of 61 meters. The number of seats in the Church around 1800. In the Western part of the Church is the famous 5-ton "rákóczi bell". Which was donated to the Church in 1637 by györgy rákóczi.

Rakoczy was supported by the population, especially the peasantry, who have risen to fight for national liberation) in the North of the Hungarian Kingdom. Followed in 1645 Linsky peace with the Holy Roman Emperor and Hungarian king Ferdinand III Habsburg, guaranteed in Hungary religious freedom and the return of all Protestants spoliation of their churches. Himself Rakoczy got in lifelong personal possession of seven Hungarian committees and other vast land. He was also granted for himself and his heirs the title of Imperial Prince.

Big Church has become a symbol not only for residents of the city of Debrecen, but for the whole of the reformed Church of Hungary. Originally on this site stood the old Church, built in the 12th century. Later, in the 15th century, it was replaced by St. Andrew's Church, built on donations of the family Dosa Debrecen. After the expansion, this temple has become the largest Gothic Church from the 16th century, but it burned down in 1564.

In 1626 the Church, which by that time it was called St. Andrew's, began to recover, and later built a separate Red tower from bare brick to big bell Rakoczy, remodeled basement walls (they can be seen in the Western end of the Great Church). However, St. Andrew's Church was burned along with the College during the fire of 1802.

Finally, in 1821 at this place was erected the Calvinist Cathedral in neoclassical style. Now it is the largest Protestant Church in the country.