Trinity Cathedral is the Cathedral of the Alexander Nevsky Lavra in St. Petersburg. In 1776, Catherine II approved the project of the temple designed by the architect I. E. Starov, and appointed him as the head of construction. The ceremonial laying of the Cathedral was made in 1778 Metropolitan Gavriil (Petrov). In 1782, one with 2 bunk bell-tower chimes were installed. On another tower was hung a bell weighing 13 tons. In 1786 the Church was completed in the rough.

In 1790, the day of St. Prince Alexander Nevsky, by Metropolitan Gabriel Trinity Cathedral was consecrated. On the same day of the Annunciation Church in the Cathedral under the gun shots transferred the relics of the Holy Prince Alexander Nevsky. In 1847 it was the air heater heating, and in the Cathedral began to serve in the winter.

In 1922, the Cathedral lost a large amount of jewelry and utensils. In 1933 the Church was closed and turned into a House of miracles and technical achievements. In 1940-e years it housed the housing authority, city sculpture Museum and warehouse. In 1956, the Cathedral was returned to believers. In 1957-1960 and 1986-1988 Cathedral was restored. Today the Church is in excellent condition, protected by the state.

Trinity Cathedral is a domed temple with 2 umya bunk towers bell towers. The architectural style of early classicism. Interior of the Cathedral space is cruciform in plan. The massive piers supporting the arches, divide it into 3 naves. The Cathedral is crowned by a dome on a high drum. The overall composition is completed by 2 of the monumental bell tower. They rise on the sides of balconies Central entrance, which is decorated with a portico of 6 columns of the Roman Doric order. The facades are covered with shallow panels and pilasters.

On the North and South entrances are bas-relief panels depicting events from the old and New Testaments. The Sculptor Was F. I. Shubin. Over the main entrance – "the Sacrifice of king Solomon in the day of the consecration of the temple of Jerusalem", below you can see a group of sculptures depicting angels with the order token of the Holy Prince Alexander Nevsky.

Inside, the building combines two forms: Basilica and cross-dome. The plan is a Latin cross. Attached Corinthian columns with gilded capitals adorn the nave. In the drum supporting the dome is 16 Windows, through which the main lighting of the temple.

The iconostasis is a semicircular niche with the Royal doors in the depths. Made of Italian white marble A. Pinkette. Parts made from bronze is made of p. P. aji, the image in the king's gate, written by I. A. Akimov, and J. Mettenleiter. In the remaining images of the iconostasis was attended G. I. Ugryumov. In the sails visible images 4 evangelists, made by Y. Mettenleiter.

The original painting of the interior was executed by F. D. Danilov. But soon she was partially lost because of the long absence of heating in the Cathedral, and therefore in 1806, the painting was replaced by another. It was created by A. della Giacomo from sketches by G. Quarenghi. In 1862 the vaults of the Cathedral were painted again. Did P. S. Titov, using sketches of F. G. Solntsev. Modeling was carried out by D. Fontana and F. Lamoni, statues of saints and 20 bas-reliefs by the sculptor F. I. Shubin. In the Western zone of the Cathedral was placed a marble bas-relief of Metropolitan Gabriel (now in the Russian Museum).

In the altar, behind the throne was placed the image of the Annunciation of the virgin, executed by R. Mengs. On the East wall is a painting of the Resurrection of Christ, created by p. P. Rubens, over the southern gate of the blessed Savior A. van Dyck. Portrait of Catherine II, D. G. Levitsky, hung over the king's place, opposite was a portrait of Peter the Great. At the tomb was located a silver lectern with Kyoto, where they were placed "colchici" with particles of relics and icons. In 1806 gave the Emperor Alexander I. on the left side of raki – the image of the Vladimir Mother of God, with the right – miraculously Saved a piece of the Robe of the Lord.

In 1862, in the Trinity Cathedral of the Tauride Palace was taken malachite canopy to shroud, which was manufactured in the years 1827-1828 in Paris in the Studio of P. F. Thomire (now in the Hermitage). Great chandelier of silver, weighing about 210 pounds, was donated to Catherine II.

From the beginning of XX century in the Cathedral too was the custom every year, on 25 October (7 November), the day of the death of Peter Ilyich Tchaikovsky, to fulfill the Liturgy of St. John Chrysostom, which he created for mixed choir.