The Church of Saint Martyr Queen Alexandra, belonging to the Budapest and Hungarian Diocese of the Russian Orthodox Church, is located in Irem. It was built as a court imperial church-tomb for Grand Duchess Alexandra Pavlovna and is the oldest Russian church in Western and Central Europe, not counting private chapels.

In 1799, Grand Duchess Alexandra, daughter of Russian Emperor Paul I, married Hungarian palatine Archduke Joseph of Habsburg, but 17 months after the wedding, she died. A Orthodox church was built at her burial site, consecrated on August 31, 1803, by Archpriest Andrei Samborsky in the name of Saint Martyr Alexandra of Rome. The church, which received court status, was assigned a priest and church clergy. Until the early 20th century, it was mainly visited by Serbs living nearby.

In 1814, the church was visited by Russian Emperor Alexander I, King of Prussia Friedrich Wilhelm, and Austrian Emperor Joseph during the Congress of Vienna. The following year, Grand Duchess Ekaterina Pavlovna visited her sister's tomb accompanied by Archduke Johann of Austria.

On September 11, 1852, the heir to the Russian throne, Grand Duke Alexander Nikolaevich, visited the church while in Hungary for maneuvers near Budapest, and in 1866, Grand Duke Konstantin Nikolaevich.

Services in the church were temporarily suspended with the onset of World War I when the clergy left for Russia. They resumed in the early 1920s.

After the 1917 revolution, Archpriest Stefan Kolumbov served in the church until his death in 1926. The church gradually fell into disrepair but was not closed. Local residents maintained it, and Orthodox priests from Budapest, including Russians, Serbs, and Hungarians, held services on commemorative dates.

The revival of the church began in 2001 when Priest Nikolai Kim became the rector, receiving the blessing of the archbishop for the restoration of the church. Restoration took place from 2002 to 2006. The crypt and the surrounding fence were restored first, then, with the support of city authorities, a stone path to the church was paved, birches were planted, outdoor lighting was installed, lanterns and benches were set up, and the facade and dome were renovated.

In 2004, with the consent of the Habsburg family, the remains of Grand Duchess Alexandra Pavlovna were transferred from Buda Castle to the restored crypt of the church. Previously, they had been moved to the Habsburg family tomb after the tomb was opened in the 1980s when the church was left unguarded.

The church is now fully restored and functions as a spiritual center. It is a historical monument, as evidenced by a memorial plaque at the entrance. Every Saturday at 10 a.m., parishioners gather for the Divine Liturgy, after which a memorial service is held in memory of Grand Duchess Alexandra Pavlovna.

On October 17, 2004, the church was visited by Metropolitan Cyril of Smolensk and Kaliningrad, accompanied by Bishop Hilarion of Vienna and Austria.