Ara de Trajano

Ara de Trajano is a Roman inscription cut into a granite boulder at Caldas das Taipas, in the municipality of Guimarães (Braga District, northern Portugal). It needs no ticket and has no queue. It is a rough block of stone carrying text from nearly two thousand years ago, beside the road between Guimarães and Braga.

What exactly is it?

Despite the name "ara" (altar), this is not a classic altar. It is an honorific inscription carved on a large granite block and dedicated to the emperor Trajan, dated to 103 CE. The text spells out his imperial titles, including Germanicus, Dacicus and Father of the Fatherland.

The block has three faces, each roughly three metres high. Only one bears the inscription. Older publications and local usage also call it the Lápide das Taipas, the Ara de Nerva and the Penedo da Moura ("the Moorish woman's rock").

Why does it matter?

A decree of 16 June 1910, published in the Diário do Governo, classified it as a Monumento Nacional, Portugal's highest level of heritage protection. For anyone interested in Roman epigraphy in the north-west of the Iberian Peninsula, it is a chance to see an inscription where it was carved rather than behind museum glass.

Where is it and how do you get there?

The monument stands in the parish of Caldas das Taipas, on the road linking Guimarães and Braga (EN 101). A car or a regional bus from either city works. The Roman-sites database Vici.org places it close to the Roman settlement (vicus) of Caldas das Taipas.

What else is nearby?

Caldas das Taipas takes its name from hot springs known since Roman times. Remains from that period turned up where the first bathhouse was built. That building was later reworked into what is now called Banhos Velhos (the Old Baths). You can easily pair the inscription with a stroll through this spa village.

When should you visit?

The stone is outdoors, so go in dry daylight. Spring and early autumn are usually pleasant in northern Portugal. Fifteen minutes is enough at the rock itself, but leave extra time for the surroundings. Low sun, in the morning or late afternoon, brings out the letters cut into the granite.

Frequently asked questions

Is the Ara de Trajano an altar? The name suggests so, but it is an honorific inscription on a granite boulder, dedicated to Trajan and dated 103 CE.

Is there an entrance fee? Our sources list no charge, and the monument stands in an open space. Check current information with the Guimarães municipality before you travel.

Is this the same monument as any Trajan inscription in Chaves? No. This one is at Caldas das Taipas near Guimarães, in Braga District.

Why the other names, such as Penedo da Moura or Lápide das Taipas? They are local and historical names for the same boulder. Some older works also call it the Ara de Nerva.