The cloister was built along different architectural styles. The archery was made in romanic style at one side, but the others date from the first third part of the XVIIIth century and was planned by Compostizo and Domingo "the portuguese". The romanic archery is an opened corridor with five arches and constitutes one of both porticoes that were added to the original one in the church. It remained hidden from XVIth century till the second decade of XXth century, when the architect Juan Torbado discovered it.

The archery we can see nowadays was restored by Menendez Pidal in 1960; it has four openings making a double ring and another one, smaller, acting as gate, in front of the gate of the temple; some of the elements are original, and others are rebuilt.

The portico ends in a cornice and several mensulae imaging wolf heads. The cloister has a right-angled plant. The best in the decoration of the frontages is a fringe of medals with portraits of queens, surrounded by sculptures. Into one of the chapels around the cloister we can see the weathercock of the tower, made in copper and coated in gold. The origin and date of this weathercock is not sure and pending on studies. We can also see the so considered older bell in Spain, smelted in 1068.

The tower was built along three phases: the first two spans date from XIth century; this is the part closest to the rampart, planned as a defensive precinct. The next two date from XIIth century and act as a belfry. The roof dates from XVIIIth century.
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