The ogival side portico, in Roman Gothic style, has capitals with zoomorphic decorations, the vaulted high choir and the high relief with the representation of St.
[1][3][4][2] Without permanent worship, the church was saved from ruin by the Department of Historical and Artistic Heritage of the Diocese of Beja.
They promoted a vast campaign of rehabilitation works, carried out with the collaboration of the Directorate General of National Buildings and Monuments (1993-1996), and then ensured its maintenance and regular opening to the public, under the patronage of a Safeguarding Commission, founded in 1993, which acts in cooperation with the municipality.
It is part of the Network of Museums of the Diocese of Beja.
[6] The church houses the Tesouro da Colegiada de Santiago, the core of the Museum of Sacred Art de Santiago do Cacém, founded in 2002.