The medieval period of the monastery of Rates was one of the most important in the Romanesque art in Portugal, by the relations it established with the governing powers, the relevance of its architecture and sculptures with diverse influences make this temple a case study that is reflected in the production of the Romanesque art of the nascent kingdom of Portugal.
According to legend, Peter of Rates came to the future Portuguese territory in the year 44 AD invited by Saint James the Great, one of Jesus's apostles.
The archeological data retrieved in 1997 and 1998 in the surrounding area allowed the documentation of the several construction phases of the monastery and in particular from the 6th century to the present day.
It is known that, in 1100, Count Henry invited monks from La Charité-sur-Loire to come to Rates, in order to establish a Benedictine monastery of the Cluniac branch.
Cluny was the most powerful religious community of the time and was headed by Abbot Hugh, a close relative of Count Henry.
The sculpture of other 12th century monastic foundations show great influence of the Rates worship, and attest to its importance in the early history of Romanesque architecture in Portugal.
The foundations and the stones and capitals of the original apse were still available, allowing for a relatively faithful restoration of the Romanesque main chapel.