Igreja de Nossa Senhora do Ó de Águas Santas

Igreja de Nossa Senhora do Ó de Águas Santas is a Romanesque church in the municipality of Maia, in Portugal's Porto District. It is classified as a National Monument and stands among the oldest surviving examples of medieval religious architecture around Porto. The church sits at the Largo do Mosteiro, in the parish of Águas Santas.

What is this church?

Today's church is the former temple of a Romanesque monastery founded in the 12th century. The monastery itself has disappeared, but the church survived and remains its most valuable legacy. For visitors, it is a chance to see how modest yet fortress-like Romanesque architecture looked in northern Portugal.

What is the history of the monastery?

The monastery first housed monks of the Order of Saint Augustine. In the 14th century it passed to the Order of Saint John of Jerusalem, the Hospitallers. In the following century it was taken over by the Order of Malta. This change of owners explains the Maltese symbolism visible on the church.

What can you see outside?

• Romanesque facade. The main portal has recessed archivolts in a broken arch, resting on four pairs of columns. The capitals are decorated with vegetal motifs.
• Bell tower. A massive rectangular tower stands at the side of the building. It is topped with a pyramidal roof and surrounded by crenellations resting on corbels, giving the structure a defensive look.
• North portal. The north side facade has a second, pointed-arch portal. A Maltese cross in relief is carved into its tympanum, a clear trace of the former owners.

Was the church altered?

Yes. After the monastery disappeared, the temple underwent structural changes. The most notable came in 1874, when a nave was added on the north side. The Romanesque structure is therefore combined with later elements, showing that the church remained a living place of worship over the centuries.

Where is it and how to plan a visit?

The church is in Águas Santas, in the municipality of Maia, within the Porto metropolitan area. Its coordinates are about 41.2104 N, 8.5773 W. It suits a short trip from Porto for anyone interested in Romanesque architecture, the history of military-religious orders and the heritage trail of the region. The facade and tower, where the oldest elements are visible, make the strongest impression from outside. Check interior opening hours before you go, as they depend on the parish.

Frequently asked questions

Is the church a National Monument? Yes, it has National Monument status in Portugal.

What period is it from? It comes from a Romanesque monastery founded in the 12th century.

Why is there a Maltese cross on the church? In the 14th century the monastery passed to the Hospitallers, and later the Order of Malta took it over. The Maltese cross is in the tympanum of the north portal.

Is it still a working monastery? No. The monastery has disappeared; the church survives.

When was the north nave added? In 1874.