 Canonised in recognition of his virtue, he was a lawyer and a judge renown for his advocacy on behalf of the poor.The stained glass window depicts some scenes concerning Saint-Yves' life.Scenes include Yves being ordained as a priest, the time when he sold his horse in Tréguier to help the poor, Jesus appearing to Yves as a leper, his giving up his room for a beggar, the miracle where he caused trees to grow to replace those cut down to build the cathedral and his death on 19 May 1303.