Sant Miquel is the most unique building in the complex, both for its architecture and its funerary functionality. It is a cemetery chapel suitable for burial and liturgy of the deceased. Originally, the building was dedicated to Saint Vincent the Martyr, and in the 12th century the name changed to Sant Miquel.
Architecturally, the church has a central plan, square on the outside and with a Greek cross inside. In the centre of the building, eight columns with reused capitals from previous buildings support a dome lit by four windows.
On the outside, the building had a corridor that surrounded the north, south, and west sides, with a door in the centre of each side that would match those of the central body.