St. Mirin's Aisle was erected in 1499, and there is a large pointed window in the east end, having jambs with single shafts. It is divided into four lights, and the arch-head is filled with good simple tracery. Beneath the eastern window is a frieze of one foot eight inches deep between two cornices of eight inches deep, which were intended for sculpture. Three compartments, measuring four feet, at the north or right side, and seven compartments, measuring ten feet, at the south or left side, are carved and filled with sculpture. Dr. Lees says the reference of them to Mirin is clear beyond all doubt: "In the one on the extreme left we see Mirin's mother bringing him to St. Congal. In the next St. Congal putting the religious habit on Mirin. In the next Mirin taking oversight of the monastery of Banchor. There is after this a blank, and then we have certain sculptures relating to Mirin's encounter with the Irish king, who wears a crown on his head. In the first we have the servant of the King driving Mirin away from the door of the palace. In the next the King roaring with pain and held by his servants. In the next the Queen lying in bed with a picture of the Virgin on the wall, it being the custom to hang such before women during confinement. Then we have the King on his knees before Mirin, and afterwards Mirin received by him with joy. The next two sculptures represent the last two acts of the Saint--the brother looking through the keyhole and seeing Mirin illuminated by a celestial light, and the Saint restoring to life the dead man in the Valley of Colpdasch.... As they are evidently earlier than the date of the erection of the chapel, they have probably been transferred with the relics of the Saint from an older shrine. They look like twelfth-century work, but it is possible they may be even earlier."[399] The ceiling of the chapel is beautifully groined, and the east end, where the altar stood, is raised four steps above the western part. The west wall contains an outer doorway from the cloister court, and there is a traceried window above it. A large ambry adjoins the door in the outer wall. The chapel was connected with the south transept by two wide archways, now built up, and near the east end is a piscina, with three-sided head, like that in the choir.