Dolmen-Chapel of São Brissos, Christianized dolmen in Santiago do Escoural, Portugal.

The Dolmen-Chapel of São Brissos consists of a 17th-century whitewashed chapel built around the surviving stones of a Neolithic dolmen. The chapel narthex is formed by the dolmen: five granite pillars remain, the former burial chamber now serves as the atrium, and the original covering slab, the "hat", is still visible, along with two pillars of the access corridor in situ. The opening facing east was closed.

This burial monument was built during the Stone Age, thousands of years before Christianity arrived. In the 1600s it was converted into a chapel, giving it a new religious purpose.

The chapel is also called Anta de Nossa Senhora do Livramento, a name linking the megalith to the chapel's patroness. The dolmen was decreed a National Monument in 1910, and the 17th-century chapel around it was classified as a Property of Public Interest in 1957. Similar conversions exist at Anta de Pavia and Anta-Capela de Alcobertas.

The site sits near the main road to Santiago do Escoural and is easy to access by foot or car. Wear sturdy shoes and respect the barriers, as it is a protected monument.

The burial chamber still holds its original megalithic stones that are thousands of years old, yet it functions as an active place for religious observance. Few prehistoric sites successfully maintain this dual role.