The Church of the Holy Trinity is an Orthodox church in Peterhof near Saint Petersburg, built between 1858 and 1860 on His Imperial Majesty's Own Dacha. It is affiliated with the Church of Venerable Seraphim of Sarov of the Saint Petersburg Diocese of the Russian Orthodox Church.

Originally, in the area of the Own Dacha, there was a wooden church dedicated to the Vladimir Icon of the Mother of God, built to the west of the palace of Elizabeth Petrovna by 1748. The church had a single dome and no bell tower. Its length was 12.8 meters, and its width was 6.4 meters. The iconostasis and icons painted on canvas were transferred from the Peter and Paul Cathedral. By the end of the 18th century, it was abolished. In 1797, the church was restored and consecrated in the name of the Holy Life-Giving Trinity. It was dismantled due to dilapidation in 1858.

On July 4 (16), 1858, at the site of this church, the spiritual father of the imperial family, Archpriest Vasily Bazhanov, performed the solemn laying of the foundation for a new stone church in the highest presence. The project was developed by architect Andrey Stakenschneider. The Trinity Church was crowned with a single multifaceted dome. The sculptural decoration for the church was done by Vitali, who replicated in a smaller scale twelve figures of angels previously made for St. Isaac's Cathedral.

Services in this church were held only once a year on the day of the Holy Trinity. Under the altar table of the newly constructed church, a slab with a carved cross, found during the demolition of the old church, was placed. The solemn consecration of the church was performed by the same priest on July 15 (27), 1860, in the highest presence. Worship services in this church were conducted once a year — on the feast of the Holy Trinity.

The forms of the stone church include elements imitating the architecture of the first half of the 18th century. The church is one-story, built on a basement. It is rectangular in plan due to the rectangular volumes of the altar and narthex adjoining the quadrangular main volume. The onion dome is set on an octagonal light drum. The windows are large. The exterior decoration was modest. The interior decoration of the church was carried out under the guidance of Professor Alexander Bryullov. The church housed a mosaic icon of the Mother of God, inserted into the upper board of the analogion.

A small bell tower was arranged separately from the church on six hollow cast-iron columns, with a tented top and a stone plinth. Its project, approved on June 17 (27), 1860, was developed by Andrey Stakenschneider. Currently, the bell tower is completely destroyed.

In 1918, the church was closed and used as a waiting hall for visitors of the so-called Household Museum, located in the nearby palace building (Own Dacha).

In the post-war years, the church building gradually fell into disrepair and was conserved in the 1970s.

In 2005, the church building was transferred to the Russian Orthodox Church and affiliated with the Church of Venerable Seraphim of Sarov in Old Peterhof. The church has now been restored, and as before, services are held only on the feast of the Holy Trinity, but the church is open.

Sources:

https://ru.wikipedia.org/wiki/Церковь_Святой_Троицы_(Петергоф)