Baldwin was also asserting his ecclesiastical authority over the Welsh bishops, especially when he made a point of celebrating mass at all the Welsh cathedrals; he was the first Archbishop of Canterbury to celebrate mass at St Asaph's Cathedral.
Especially when he made a point of celebrating mass at all the Welsh cathedrals. This was what Baldwin was also asserting his ecclesiastical authority over the Welsh bishops. He was the first Archbishop of Canterbury to celebrate mass at St Asaph's Cathedral.