This megalithic burial monument is a structure built between the beginning of the 4th and the middle of the 3rd millennium BC, "roughly" belonging to the cultural horizon generally accepted for this region of Alentejo, pertaining to the so-called "megalithic universe of Évora”, whose prototype is assumed by the Anta Grande da Comenda da Igreja in the municipality of Montemor o Novo.
This anta (dolmen), excavated in 1965 by the researcher Henrique Leonor Pina, quickly became known in archaeological circles as one of the largest megalithic monuments found, until today, in the Iberian Peninsula. Furthermore, the mound measuring c. 50m in diameter of base was fully sealed being visible only, the tops of the slabs that complete the burial chamber.
The monument consists of a characteristic polygonal burial chamber, built with 7 huge standing stones c.8 m above the ground, as well as the respective access corridor, of an elongated rectangular plan, with c. 12 m length, 2 m height and 1,5 m width, composed by several linteled supports of small dimensions. As to the coverage of these two interconnected bodies, the burial chamber consists of a single granite slab, while that of the corridor was made with small slabs attached to each other (...)
Still in reference to the corridor, it should be mentioned that its opening was marked by the presence of a "menir-stela" also of remarkable volumetry and profusely decorated with the so-called "dimples".
During the excavations various materials that are currently deposited in the Museum of Évora have been found. Among them - due to their connotation to the "megalithic universe of Évora" - deserve special mention: the characteristic idoliform shale plates, crosiers, necklaces, as well as a multiplicity of objects made of copper and a vast number of ceramic artifacts, included In the group of bowls from Alentejo.