The dolmen-chapel of S. Brissos, or the feast of Our Lady of Deliverance, in the Municipality of Montemor-o-Novo near Evora, is a curious example of the adaptation of megalithic monument (dolmen/anta) to a chapel for Christian worship. The Dolmen was built between the IV and the III millennium BC. From the original monument, it is possible to identify the slab of the cover and the five pillars. It is painted in white, with a blue stripe at the base, by the way of typical Alentejo houses. Everything seems to indicate that at the origin of the Christianization of this Dolmen was the concern to separate the religious space from the prehistoric burial space. It has been a National Monument since 1910.
The ancestral cults related to this sacred Dolmen did not end till recently years. This Saint - Lady of Deliverance was the helper of pregnant and infertile women who asked her to become pregnant and give birth easily. In the years of drought, the villagers brought gifts to the Lady of Deliverance and asked her for rain. Even today, some people come to the dolmen to make a wish. Rumors says the wishes come true.