Rotunda, also called the Chapel of St. Longina is a small, originally Romanesque church located in the New Town district. Before this area was incorporated into Prague, it was the parish church of the Rybniček settlement. The twelfth-century building, the smallest of the Prague rotundas, held secular functions for a long time. It currently serves the Greek Catholic community.
The chapel has retained its Romanesque form, which is clearly visible despite the plasters laid on the stone wall and a baroque lantern added in the 17th century. After desacralization of the temple and conversion into a warehouse in 1783, it was demolished in the next century. The demolition did not take place and in 1929 the chapel was restored. The next renovation was carried out in 2000 - plastering was done and the original stone facade was unveiled.
St. Longin, now somewhat forgotten, was worshiped as the first martyr by early Christianity (he was to die on Pilate's order). He began his path to holiness by driving a spear into the side of Christ hanging on the cross (the spearhead is one of the relics kept in St. Peter's Basilica). Then he converted, was baptized and began to teach.