The two naves

Saint Mary's Cathedral or la cathédrale Sainte-Marie in French, facing east, consists of two aisles equal in height but unequal width, both lined with side chapels.
The main nave, built first in the second half of the XIV century, is formed by five bays and a pentagonal apse.
The north nave is shorter, due to the encroachment of the tower. It only has four bays and was completed in the fifteenth century by an apse.
The two aisles are covered with ribbed vaults finishing with penetrating vaults on powerful cylindrical stone pillars, whereas all the walls is built of brick. Length of the main nave 23m, vault height 18m originally 16m today.
Walk towards the choir and sit on a bench to the left of the aisle in order to observe the stained glass windows dating from the Renaissance.
From there you can see the windows of the three bays of the apse and those who are above the arches of the south side chapels.
These windows were commissioned under the episcopate of two members of the Gascon family Bilhères who were bishops of Lombez from the late fifteenth to early sixteenth century. Their coats of arms are visible at the bottom of the central window of the apse.
In the three large windows of the apse is illustrate the life of Mary and her son Jesus; in the window above the Episcopal throne, Pentecost, and in the four other southern wall windows, the evangelists.
For a long time, this set of windows was awarded to Arnaud de Moles, the master glassmaker of Auch Cathedral, research is underway to find the author of stained glass windows of Lombez.
The works of embellishment of the cathedral were usually financed on personally by the bishops, which explains why some of the artists recruited came from regions outside Gascony.