 This window, also known as the Vitre des Chanoines Geffroy et Rioc de Tréanna, and situated in the south-facing transept's east wall, has five lancets.In the first, Saint Eloi with a hammer in his right hand is presenting Canon Geffre or Geffroy de Trėanna, archdeacon of Mans, rector of Crozon and canon of the cathedral from 1486 to 1496.The second lancet depicts Sainte Geneviève, the third Jesus on His Cross, the fourth Saint Martin giving up his cloak and the fifth Saint Anthony presenting Rioc de Tréanna, who served the cathedral as a canon in 1487, In the tympanum are the apostles which had previously decorated the apsidal chapel from 1837 to 1876.