The choir is perched on a superb lowered arch, ribbed vault and original sconces, crescería embellished with openwork balustrade topped by small angles in coral stands. Throughout the bow was written in gold letters on a blue field, the following:

HOLY MARY CONCEIVED WITHOUT ORIGINAL SIN IN THE FIRST MOMENT OF HIS BEING

Disappeared in the restoration of the last century (Ramón Parro) and testifies to the defense of the dogma of the Immaculate Conception in 1616 by the inhabitants of the monastery.

In the center of the arch between Elizabethan signs, a royal herald, kneeling on lectern, presented arms, the tradition wants it to be self-portrait of Juan Guas, as author of the monument is known.

The sacristy, a spacious and high ship bleached impresses visitors with its three vaults, of Germanic taste, with key-shaped finials at the intersection of their bows. Today he has no role to serve as a transit for the visit of the interior.

Relic of the eighteenth century has been the arched niche in a recumbent dead in attitude to stand up on itself, seems to put on their lips the Latin phrase in the headwall and translated into Castilian, says: “I hope, as I get the resurrection “(Job 14, 14). It seems to imply that this room was some time dedicated to serving the religious burial Community.