| Tenure | Incumbent | Notes |
|---|
| Diocese of 'Glamorgan and Gwent' - Traditional list |
| 522 to c.550 | Dyfrig | Bishop of Ergyng |
| c. 550 to c.610 | Teilo | Bishop of Teilo |
| c.650 to c.700 | Oudoceus | |
| ??? to ??? | Ubylwinus | 7th century bishop, probably of Ergyng |
| ??? to ??? | Aedanus | 7th century bishop, probably of Ergyng |
| ??? to ??? | Elgistil | 7th century bishop, probably of Ergyng |
| ??? to ??? | Iunapeius | 7th century bishop, probably of Ergyng |
| ??? to ??? | Comergius | 7th century bishop, probably of Ergyng |
| ??? to ??? | Arwistil | 7th century bishop, probably of Ergyng |
| ??? to ??? | Gurvan | 8th century bishop, probably of Gwent |
| ??? to ??? | Guodloiu | 9th century bishop, probably of Gwent |
| ??? to ??? | Edilbinus | 9th century bishop, probably of Gwent |
| ??? to ??? | Grecielis | 9th century bishop, probably of Gwent |
| c.700 to ??? | Berthwyn | Bishop of Teilo; succeeded Oudoceus according to the Llandaff Charters |
| ??? to ??? | Tyrchanus | |
| ??? to ??? | Elvogus | probably a mistake: Elfoddw, Bishop of Bangor |
| ??? to ??? | Catguaret | |
| ??? to ??? | Cerenhir | |
| ??? to 874 | Nobis | Bishop of Teilo; probably the same as the Bishop of St David's |
| 874 to ??? | Nudd | suggested 1st Bishop of Llandaff |
| ??? to 927 | Cimeliauc | |
| 927 to 929 | Libiau | |
| ??? to ??? | Wulfrith | |
| ??? to ??? | Pater | |
| ??? to 982 | Gugan | |
| 982 to 993 | Marcluith | |
| 993 to 1022 | Bledri | |
| Diocese of Llandaff |
| 1022 to 1059 | Joseph | |
| 1059 to 1107 | Herewald | |
| 1107 to 1134 | Urban | Archdeacon of Llandaff |
| 1134 to 1140 | vacant | For 6 years |
| 1140 to 1148 | Uhtred | |
| 1148 to 1183 | Nicholas ap Gwrgant | |
| 1186 to 1191 | William de Saltmarsh | possibly Prior of Goldcliff, Saltmarsh being still a named part of that parish |
| 1193 to 1218 | Henry de Abergavenny | Prior of Abergavenny |
| 1219 to 1229 | William de Goldcliff | A priory established at Goldcliff since 1113 |
| 1230 to 1240 | Elias de Radnor | |
| 1240 to 1244 | William de Christchurch | |
| 1245 to 1253 | William de Burgh | |
| 1253 to 1256 | John de la Ware | |
| 1257 to 1266 | William de Radnor | |
| 1266 to 1287 | William de Braose | |
| 1287 to 1297 | Philip de Staunton vacant | According to Prynne, or |
| According to general consensus |
| 1297 to 1323 | John de Monmouth | |
| 1323 to 1323 | Alexander de Monmouth | Elected only |
| 1323 to 1347 | John de Egglescliffe | Translated from Connor, Ireland |
| 1347 to 1361 | John Paschal | |
| 1361 to 1382 | Rodger Cradock | Translated from Waterford, Ireland |
| 1383 to 1385 | Thomas Rushook | Confessor to Richard II; translated to Chichester |
| 1385 to 1389 | William Bottlesham | Titular Bishop of Bethlehem; translated to Rochester |
| 1390 to 1393 | Edmund Bromfeld | |
| 1394 to 1395 | Robert Tideman of Winchcombe | Abbot of Beaulieu; translated to Worcester |
| 1395 to 1396 | Andrew Barret | |
| 1396 to 1398 | John Burghill | Confessor to Richard II; translated to Lichfield & Coventry |
| 1398 to 1407 | Thomas Peverel | Translated from Ossory, Ireland; translated to Worcester |
| 1408 to 1423 | John de la Zouche | |
| 1425 to 1440 | John Wells | |
| 1440 to 1458 | Nicholas Ashby | Prior of Westminster |
| 1458 to 1476 | John Hunden | Prior of King's Langley; resigned |
| 1476 to 1478 | John Smith | |
| 1478 to 1496 | John Marshall | |
| 1496 to 1499 | John Ingleby | Prior of Shene |
| 1500 to 1516 | Miles Salley | Abbot of Eynsham |
| 1517 to 1537 | George de Athequa | Chaplain to Queen Catharine (with whom he left Spain for England) |
| 1537 to 1545 | Robert Holgate | Prior of Wotton; translated to York |
| 1545 to c.1557 | Anthony Kitchin | Abbot of Eynsham |
| c.1557 to 1560 | vacant | For 3 years |
| 1560 to 1575 | Hugh Jones | |
| 1575 to 1591 | William Blethyn | Prebendary of York |
| 1591 to 1594 | Gervase Babington | Prebendary of Hereford; translated to Exeter |
| 1594 to 1601 | William Morgan | Translated to St Asaph |
| 1601 to 1618 | Fraser Godwin | Canon of Wells; translated to Hereford |
| 1618 to 1619 | George Carleton | Translated to Chichester |
| 1619 to 1627 | Theophilus Field | Rector of Cotton, Suffolk; translated to St David's |
| 1627 to 1639 | William Murray | Translated from Kilfenora, Ireland |
| 1639 to c.1644 | Morgan Owen | |
| c.1644 to 1660 | vacant | |
| 1660 to 1667 | Hugh Lloyd | Archdeacon of St David's |
| 1667 to 1675 | Francis Davies | Archdeacon of Llandaff |
| 1675 to 1679 | William Lloyd | Prebendary of St Paul's, London; translated to Peterborough |
| 1679 to 1707 | William Beaw | Vicar of Adderbury, Oxfordshire |
| 1707 to 1724 | John Tyler | Dean of Hereford |
| 1724 to 1728 | Robert Clavering | Canon of Christchurch, Oxford; translated to Peterborough |
| 1728 to 1738 | John Harris | Prebendary of Canterbury |
| 1738 to 1740 | Matthias Mawson | Rector of Hadstock, Essex; translated to Chichester |
| 1740 to 1748 | John Gilbert | Dean of Exeter; translated to Salisbury |
| 1748 to 1754 | Edward Cresset | Dean of Hereford |
| 1754 to 1761 | Richard Newcome | Canon of Windsor; translated to St Asaph |
| 1761 to 1769 | John Ewer | Canon of Windsor; translated to Bangor |
| 1769 to 1769 | Jonathan Shipley | Dean of Winchester; translated to St Asaph |
| 1769 to 1782 | The Honourable Shute Barrington | Canon of St Paul's, London; translated to Salisbury and then to Durham |
| 1782 to 1816 | Richard Watson | Regius Professor of Divinity, Cambridge; Archdeacon of Ely |
| 18 July 1816 to 1819 | Herbert March | Translated to Peterborough |
| 15 May 1819 to 1826 | William Van Mildert | Translated to Durham |
| 1826 to 1827 | Charles Richard Sumner | Translated to Winchester |
| 1827 to 1849 | Edward Copleston | died in office |
| 1 November 1849 to 16 December 1882 | Alfred Ollivant | Canon of St David's, and Regius Professor of Divinity, Cambridge; died in office |
| 16 February 1883 to 1905 | Richard Lewis | |
| 1905 to 1931 | Joshua Pritchard Hughes | |
| 1931 to 1939 | Timothy Rees | |
| 1939 to 1957 | John Morgan | Archbishop of Wales 1949 |
| 1957 to 1971 | William Glyn Hughes Simon, DD | Translated from Swansea & Brecon. Archbishop of Wales 1968 |
| 1971 to 1975 | Eryl Stephen Thomas | Translated from Monmouth |
| 1976 to 1985 | John Worthington Poole Hughes, MA | Translated from Southwest Tanganyika. Assistant Bishop of Llandaff |
| 1985 to 1999 | Roy Thomas Davies | |
| 1999 to present | Dr Barry Cennydd Morgan | Archbishop of Wales 2002 |