They gradually disappeared as an office by the 12th century in the West and were replaced by archdeacons to administer subdivisions of a diocese.
ðeɪ ɡɹˈædʒuːəli dˌɪsɐpˈɪɹd æz ɐn ˈɑːfɪs baɪ ðə twˈɛlfθ sˈɛntʃɚɹi ɪnðə wˈɛst ænd wɜː ɹᵻplˈeɪst baɪ ˌɑːɹtʃdˈiːkənz tʊ ɐdmˈɪnɪstɚ sˌʌbdᵻvˈɪʒənz əvə dɪoʊsˈiːz.