San Salvatore in Onda is a restored 13th century convent church.
Onda is the Italian word for wave, and the appellation is most certainly a reference to the intermittent flooding of the river Tiber, which, for centuries, caused severe problems until the embankments were built at the end of the 19th century.
The fabric of the church is substantially medieval, but the main body of the interior is 19th century in appearance. In 1835, the church was granted to Vincenzo Pallotti (1795-1850), a Roman priest who had founded the Society of the Catholic Apostolate, better known as the Pallottines. A major restoration of the church was undertaken from 1867 to 1878 by Luca Carimini.
High Altar
The nave arcades rest on twelve ancient columns; all but one of the capitals are also ancient (one is mediaeval). The columns are from various ancient buildings and are not a matching set.
The high altar has a baldacchino with four marble columns.
San Vincenzo Pallotti
The body of San Vincenzo Pallotti lies encased under the high altar. He was canonised by Pope John XXIII (r. 1958-63) on January 20th 1963.