Although there had been abbot-bishops at
Clonard Abbey since the sixth century, the Diocese of Clonard proper was not formally established until 1111. It was one of the twenty-four dioceses established by the
Synod of Rathbreasail. The diocese covered roughly the western part of the
Kingdom of Meath with the bishop's seat located at
Clonard Abbey. During the twelfth century, the bishops of Clonard acquired most of Meath as their territory and frequently used the title "Bishop of Meath" or "Bishop of the men of Meath". After Bishop
Simon Rochfort transferred his seat from Clonard to
Trim in 1202, the normal style became the "Bishop of Meath". ==History of the Diocese of Kildare==