Fana Church history is long and complicated. Historians assert that the church has been rebuilt and enlarged several times. Fana Church was mentioned in writings for the first time in 1228, when Pope Gregory IX released a conscription to the vicar and brothers at 'the holy cross church and hospital in Fana'. Parts of the existing church building are from the Romanesque age, and the walls show signs of there having been a stone building at the site, most likely a church, before 1220. Due to this, it is believed that the core of the church was built in the second half of the 12th century.
The legend 'The Holy Silver Cross' is connected to Fana church. In 1626, when the king gave professor Worm at Copenhagen University commission to register all historical objects and occurrences in Bjørgvin bishopric, Skonvig, the son of a priest, sent a letter about the legend. Two fishermen found a silver cross at Korsnes in Korsfjorden, and they tried to get the cross on land near Milde. However, the cross was too heavy to carry, so they knew the cross was meant for Fana. When they arrived at Fanahammeren, the cross was easy to carry. They brought it to the church where it was settled at the altar. One of the fishermen was blind, but when he touched the cross and scratched his eyes he gained sight again. The story about the healing cross reached many, and pilgrims visited the church hoping to be healed. It is said that at a small knoll close to the church there was a lot of crutches and canes that pilgrims had left behind after having been healed at the cross. According to the legend, the priest in Fana burned 6 horse loads of crutches in 1546.
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.