From its foundation the diocese included southern and western Warwickshire (an area known as Felden). In 1837 the north and east of Warwickshire (Arden) which formed the archdeaconry of Coventry in the Diocese of Lichfield and Coventry was transferred to the diocese of Worcester. In 1905 an area in northern Warwickshire was split off as the Diocese of Birmingham, and in 1918 an area approximating to the rest of Warwickshire was created the Diocese of Coventry.