Saint Aristobulus, the brother of Saint Barnabas is called the Apostle of Britain and was its first bishop.  He was ordained and sent to Britain by the Apostle Paul who mentions him in his epistle to the Romans (16:10). He endured the torments and malice of the pagans, eventually baptising them, and having established the Church here he reposed in peace. 

O Holy Apostle Aristobulus, intercede to our merciful God, that He may grant our souls forgiveness of sins.