A church at the site of current San Francesco, dedicated to St John, was present since perhaps the seventh-century, since nearby Christian burial appear to date from then. In around 1244, the church began to be administered by priests from the Cathedral of Acqui. Around 1410, it became associated with the Franciscan order, and rebuilt and rededicated. The convent was suppressed in 1802, and the church was affiliated with the Confraternity of San Giuseppe, who briefly changed the name of the church. In 1824, the Franciscans returned, and they rebuilt the church in a neoclassic-style, adding the Facade, under the design of Ferraris in 1835, completed in 1854.
Parts of the church are ancient. The bell-tower and apse date to the 15th century. But other parts reflect refurbishments along the centuries, including the 19th-century reconstruction. The broad brick facade (1835–1854) shows eclectic styles with a triangular lower tympanum and monumental order pilasters.
The interior houses an Immaculate Conception by il Moncalvo; an Adoration of the Magi by Raffael Angelo Soleri; and a Madonna and Child with Saint Francis and Antony of Padua by Pietro Beccaria. The ceilings were frescoed by the 19th-century painter Pietro Ivaldi, detto il Muto di Toleto.
References:The church of the former Franciscan monastery was built probably between 1515 and 1520. It is located in the UNESCO World Heritage Site of Old Rauma. The church stands by the small stream of Raumanjoki (Rauma river).
The exact age of the Church of the Holy Cross is unknown, but it was built to serve as the monastery church of the Rauma Franciscan Friary. The monastery had been established in the early 15th century and a wooden church was built on this location around the year 1420.
The Church of the Holy Cross served the monastery until 1538, when it was abandoned for a hundred years as the Franciscan friary was disbanded in the Swedish Reformation. The church was re-established as a Lutheran church in 1640, when the nearby Church of the Holy Trinity was destroyed by fire.
The choir of the two-aisle grey granite church features medieval murals and frescoes. The white steeple of the church was built in 1816 and has served as a landmark for seafarers.