Dating to origins in the thirteenth century, the Igreja de São Leonardo is the parish church to the region of Atouguia da Baleia in Peniche. It is the oldest place of Christian worship in Peniche. According to local legend, the church was initially constructed with whale bones that had washed up on the shoreline nearby.
A Portuguese national monument since 1949, almost as soon as it was built it became a burial place for the Counts of Atouguia. Perhaps as a result, it has seen a successive series of embellishments throughout the centuries.