This window is in the cloisters of Chester Cathedral but the building in the background is, I believe, Lichfield Cathedral
Chad (Old English: Ceadda; died 2 March 672) was a prominent 7th century Anglo-Saxon churchman, who became abbot of several monasteries, Bishop of the Northumbrians and subsequently Bishop of the Mercians and Lindsey People. He was later canonized as a saint. He was the brother of Cedd, also a saint. He features strongly in the work of Bede the Venerable and is credited, together with Cedd, with introducing Christianity to the Mercian kingdom.
Chad gives his name to Birmingham’s Roman Catholic cathedral, where there are some relics of the saint: about eight long bones (three of them are femurs!!!) It is the only cathedral in England that has the relics of its patron saint enshrined upon its high altar. The Anglican Lichfield Cathedral, at the site of his burial, is dedicated to Chad, and St Mary, and still has a head chapel, where the skull of the saint was kept until it was lost during the Reformation. The site of the medieval shrine is also marked.
Church In The Window -The English Church