Church of Peace (Sanssouci)
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The Protestant Church of Peace (German: Friedenskirche) is situated in the Marly Gardens on the Green Fence in the palace grounds of Sanssouci Park in Potsdam, Germany. The church was built according to the wishes and with the close involvement of the artistically gifted King Frederick William IV and designed by the court architect, Ludwig Persius. After Persius' death in 1845, the architect Friedrich August Stüler was charged with continuing his work. Building included work by Ferdinand von Arnim and Ludwig Ferdinand Hesse also.
The cornerstone of the churchhouse was laid on April 14, 1845. The building was dedicated on September 24, 1848, though construction continued until 1854. The structure resembles a High Italian monastery.
 The Church of Peace
The church is a columned basilica with three naves and no transept, with a free-standing belltower. The 13.5 m high central nave overlaps the side aisles, which are half as wide. An arcade of central arches mark the crossing point. An etching of the Basilica di San Clemente in Rome made by early Christians resembles a draft design of the Potsdam church.
The religious Frederick William IV desired a flat coffered ceiling on the inside, with gold stars on a blue base painted on the panels. The king saw the design of early Christian sacred buildings, converted from market and court halls, as particularly appropriate.
An original Venetian mosaic from the early 13th century decorates the church's apse. It was originally in a church in San Capriano on Murano, Venice until its abandonment. While he was crown prince Frederick William had it bought at auction for 385 thalers and brought to Potsdam by canal.
The display shows the enthroned Christ with the Book of Life, the right hand upheld in blessing. At each side stand Mary and John the Baptist. Next to them stand the apostle Peter and Saint Cyprian, martyred by beheading in 258 and patron saint of Saint Cipriana, wearing chasubles. As an allegory for the Holy Spirit, a pigeon decorates the vertex of the hemisphere. Over the heads of the archangels Raphael and Michael a lamb shines as a symbol of Christ. On the semicircle of the Apse a Latin inscript reads, according to Martin Luther's translation: "Lord, I have love for the site of your house and the place where your glory resides".
The altar canopy, which rests on four dark green columns, was created from Siberian jasper (semi-precious stones) and was a gift from Tsar Nicholas I of Russia, the king's brother in law. It was installed in the Church of Peace in 1842.
In the right-hand aisle lies the former baptistery. The six-sided baptismal stone was relocated in 1965.
The counterpart to the baptistery is the sacristy in the left-hand aisle. After the death of Frederick William IV it was used temporarily as a mausoleum for him and for other deceased members of the House of Hohenzollern. The son of Emperor Friedrich III and his wife Empress Victoria, as well as the Princes Sigismund and Waldemar, were entombed here until 1892. In 1920 the youngest son of Wilhelm II, the last Emperor of Germany, was interred in the sacristy. After 1931 he was moved to the Antique Temple.
Under two marble tablets, embedded in the ground in front of the steps of the altar room, the royal crypt can be found. Frederick William IV died following several strokes on 2 January 1861, and following the dedication of the crypt in October 1864 his coffin was placed there. The heart of the king, however, rests in the mausoleum of Charlottenburg Palace in Berlin. He was laid in the ground at the feet of his parents, King Frederick William III and Queen Louise.
In 1873 his wife Elisabeth Ludovika followed him to the grave. Both coffins, made out of English tin, carry the same inscript as the marble plates in the church floor: "Here he rests in God, his Redeemer, in the hope of resurrection in the soul and a merciful judgement, justified solely by the service of Jesus Christ our most holy Saviour and Only Life".
In the year of the crypt's dedication, the flooring of the church was completed as Frederick William IV had wished; the design is an intricately interleaved endless ribbon which represents eternity.
The free-standing, 42 m high campanile (belltower), on the southern side, is based on the design of the campanile of Santa Maria in Cosmedin in Rome. An aedicula (column-bearing dais) on the east side bears the fresco "Jesus in Gethsemane" by Eduard Steinbrück. The tower has seven open floors. The four bells, named Gratia, Clementia, Pax and Gloria, sound from the third floor above the clockwork. In 1917 and 1945 they were all taken from the tower to be melted down for the war effort, but escaped this unhappy fate.
An open porch (narthex) across the western side of the portal opens into an inner courtyard (atrium). The larger-than-life statue of Christ on the fountain is a copy of the marble original, created in 1821 by Bertel Thorvaldsen, in the Copenhagen Church of Our Lady. The ancient Greek inscript on the edge of the fountain reads: "Cleanse thyself of thy sins and not just thy face". An arcade surrounds the inner courtyard.
 Kaiser Friedrich Mausoleum
The Kaiser Friedrich Mausoleum was added to the north side between 1888 and 1890. The plans were drawn up by Julius Carl Raschdorff, who also designed the Berlin Cathedral from 1893 to 1905, in the style of the Baroque-influenced Italian High Renaissance. The 17th century Chapel of the Holy Tomb in Innichen, South Tyrol, Italy, serves as an archetype for the Mausoleum, which in turn was based on the chapel on Jerusalem's Calvary Hill.
The mausoleum is a domed structure with an oval outline and an attached rectangular altar room. The inside contains a surrounding gallery and the domed roof, supported by two black columns, one on top of the other, which run around the edge. A golden mosaic on the inside of the roof shows alternating angels and palm trees.
In the middle of the rotunda stands the marble sarcophagus of Emperor Friedrich III of Germany and his wife Victoria, formerly Princess Royal of Great Britain and Ireland. The effigies were executed by Reinhold Begas, who also completed the sarcophagi which stand on the side walls of the altar room and contain the remains of Princes Sigismund (1864–1866) and Waldemar (1868–1879), sons of the imperial couple who both died young. They were transferred into the mausoleum from the Church of Peace.
Since 1991, the plain coffin of the Soldier-King Frederick William I has stood on the steps to the altar. Originally entombed in the now destroyed Garrison Church in Potsdam, like his son Frederick the Great, the coffin was moved shortly before the end of the war in 1945. Until 1953 it lay in the Elisabeth Church in Marburg, Hesse, and until 1991 in Burg Hohenzollern at Hechingen, Baden-Württemberg. The original black marble sarcophagus was destroyed in 1945, and the current one is a copy made from copper.
 Heilsbronn Porch
Parallel to the southern arcade runs the cloister with the Heilsbronn Porch, an entrance to the Marly Gardens. It is a replica of a Roman tiered porch at the former refectory in the Heilsbronn Cloister in Middle Franconia, which caught the eye of the architect Ludwig Ferdinand Hesse while he was on a study trip in 1828. He instructed the Berlin potter Tobias Feilner to imitate the entrance in reddish terracotta. Frederick William IV explicitly rejected Hesse's suggestion to incorporate the copy, but Hesse nonetheless had the porch installed two years after the king's death. The original from the Heilsbronn Cloister was brought to the National Germanic Museum in Nuremberg, where it was almost entirely destroyed at the end of the Second World War in 1945.
 Adjacent buildings and gates
To the south, along the length of the bell tower, stretches the Cavalier's House, a former guest house. Adjoining it is the Porter's House with its short tower and in the right-hand nook is the Rector's and Schoolhouse.
Frederick William IV had two entrances to the park created for the congregation. One a low auxiliary gate built near the Green Fence. Through it visitors arrive with "reverentially bowed posture" onto the grounds of the Church of Peace.
A second entrance, that is no longer used today, lies on the eastern edge of the park, near the Obelisk. The Gate of Three Kings was created by Ludwig Ferdinand Hesse in the classical style and shows sculptures of Kings David, Solomon and Charlemagne.
 The park grounds
With the eastern outskirts of the park Frederick William IV wanted to create, among others, a connection between the park and the city. In the Marly Gardens, the kitchen garden of the soldier-king Frederick William I, a place of tranquility was created. The garden architect Peter Joseph Lenné bedded the group of buildings in an attractive park with two distinct gardens.
The Garden of Peace, on the side of the city in the east, is planted with small groups of trees and bushes laid out and contains the Pool of Peace. The water plays around the church building on the north and east sides. The Marly Gardens, only three hectares in area, adjoins the site of the church on the west. The compact planting of groups of trees and bushes, access balconies, flower beds and sculptures reflect a picture of romantic playfulness.
- PEDA-Kunstführer: Die Friedenskirche zu Potsdam-Sanssouci. Kunstverlag PEDA, Passau ISBN 3-930102-62-5 (Publisher: Evangelische Friedens-Kirchengemeinde, Potsdam, Am Grünen Gitter)