Originally known as Sancti Petri de Portu, many regard the Town Church as the Cathedral Church and the finest in the Channel Islands. The first mention of the church in official documents was in 1048 when it is thought to have been given to the Abbot of Marmoutier by William of Normandy. It is likely that the original building was made of wood. The current building was built over a 200 year period with the chancel completed in the 12th century and the chapel added in 1462. The church was completed in 1475. However restoration work was carried out to the spire in 1721. The bells were recast in 1736 and in 1913. The clock was installed in 1781. Up until 1886, the rows of pews went in various directions and at that time some re-alignment was undertaken.
A copy of the text of an order from Pope Sixtus IV granting neutrality to the island is displayed in the church. In 1414, the English Crown took over the church but interestingly the church paid tithes to the Bishop of Coutanches until 1548. Up until the middle 1700's, the Church was completely surrounded by street markets and houses. A stream ran past the Church and around the harbour near to Woolworths. A memorial to the famous islander Major General Sir Isaac Brock can be found inside the Church together with many other memorials.
In 2001, work started on repairing the 500 year old oak vaulted rafters in the roof, which are now rare in England and believed to be the last surviving of this type in the Channel Islands. The joints are now quite weak and are being strengthened with stainless steel plates on the ridges, but the beams themselves remain in good condition. They work the subject of public outcry when the church decided to replace the rafters in 2000, but the Ecclesiastical Court decided after taking expert advice, that the roof could be saved.
References:The Chapel of St. Martin is the only completely preserved Romanesque building in Vyšehrad and one of the oldest in Prague. In was built around 1100 in the eastern part of the fortified outer ward. Between 1100 and 1300, the Rotrunda was surrounded by a cemetery. The building survived the Hussite Wars and was used as the municipal prison of the Town of the Vyšehrad Hill.
During the Thirty Years’ War, it was used as gunpowder storage, from 1700 to 1750, it was renovated and reconsecrated. In 1784, the chapel was closed passed to the military management which kept using it as a warehouseand a cannon-amunition manufacturing facility. In 1841, it was meant to be demolished to give way to the construction of a new road through Vyšehrad. Eventually, only the original western entrance was walled up and replaced with a new one in the sountren side. The dilapidating Rotunda subsequently served as a shelter for the poor.