Bells were the most widely-heard musical isntruments of the mIddle Ages, ringing loudly form belfries and church towers. For many people, bells were the only available measurements of the passage of time, and peals of bells marked great festivals and public occasions. This is from the Pontifical of Guy de Mohun, bishop of St Davids 1397-1407, showing here the service for blessing bells. An acolyte holds the book as the bishop raises his right hand. The silver bells are suspended in the windows of the belfry. The manuscript was probably begun for Guy de Mohun, who was consecrated bisop on 8 September 1398. Parker Library MS 79, f. 210r.