The diocese covers the historic extent of Ceredigion, Carmarthenshire and Pembrokeshire, together with a small part of western Glamorgan.

The present cathedral, which was begun in 1181, stands on the site of a monastery founded in the 6th century by Saint David.

The diocese is divided into the three archdeaconries of St Davids, Carmarthen and Cardigan (additionally, Mones Farah serves as Archdeacon Missioner).

The history of the diocese of St Davids is traditionally traced to that saint (Dewi) in the latter half of the 6th century.

Records of the history of the diocese before Norman times are very fragmentary, however, consisting of a few chance references in old chronicles, such as Annales Cambriae and Brut y Tywysogion (Rolls Series).

Originally corresponding with the boundaries of Dyfed (Demetia), St Davids eventually comprised all the country south of the River Dyfi and west of the English border, with the exception of the greater part of Glamorganshire, in all some 3,500 square miles (9,100 km2).

[11] Farah served his title as assistant curate at Aberystwyth before becoming Chaplain to the University of Wales, Lampeter in 1991.

He moved to England in 1998 to become a Team Vicar in Great Baddow, returning to Aberystwyth in 2014 as priest-in-charge.

Alongside his current role as archdeacon, he is also a Canon of St Davids Cathedral.

[14] This was formed by the union of the parishes of Capel Cynon, Cilcennin, Ciliau Aeron, Cribyn, Dihewyd, Gwenlli, Llanarth St David, Llanarth St Teilo, Llanerch Aeron, Llanfihangel Ystrad, Mydroilyn, Talgarreg and Trefilan.

[17] 1original dedication to St Cannen 2original dedication to St Mary This was formed by the union of the parishes of Borth, Capel Bangor, Comins Coch, Eglwysfach, Eglwys Newydd, Elerch, Llanafan-Y-Trawscoed, Llanbadarn Fawr, Llandre, Llanfihangel-Y-Creuddyn, Llangynfelyn, Llantrisant, Penrhyncoch, Pontarfynach, Ponterwyd, Ysbyty Cynfyn and Ysbyty Ystwyth.

[21] This was formed by the union of the parishes of Aber-Porth, Blaenporth, Bridell, Capel Colman, Cardigan, Castellan, Cilgerran, Eglwyswrw, Llandygwydd, Llanfair Nant-Gwyn, Llanfihangel Penbedw, Llangoedmor, Llechryd, Maenordeifi, Monington, Mwnt, Nevern, Penrhydd, St Dogmael's and Y Ferwig.

1original dedication to St Llawddog 2church demolished 2000, services continue in a converted schoolroom.

[41] This was formed by the union of the parishes of Bangor Teifi, Capel Dewi, Capel Mair, Cenarth, Felindre, Llandyfriog, Llandysul, Llanfihangel-ar-Arth, Llangeler, Llangynllo, Newcastle Emlyn, Pen-Boyr, Pencader, Pontsian, Rhos, Tregroes and Troedyraur.

[45] This was formed by the union of the parishes of Aberaeron, Cross Inn, Henfynyw, Llanbadarn Trefeglwys, Llanddewi Aberarth, Llandysiliogogo, Llangrannog, Llanina, Newquay and Penbryn.

[54] This was formed by the union of the parishes of Betws Bledrws, Betws Leucu, Blaenpennal, Cellan, Cwmann, Gartheli, Lampeter, Llanbadarn Odwyn, Llanddewi Brefi, Llanfair Clydogau, Llangeitho, Llangybi, Llanllwni, Llanwenog, Llanwnnen, Llanybydder, Llanycrwys, Maestir, Pencarreg, Pontrhydfendigaid, Silian, Strata Florida, Tregaron and Ystrad Meurig.

[80] This was formed by the union of the parishes of Brechfa, Carmel, Cwrt-Henri, Felin-Gwm, Llandeilo Fawr, Llanegwad, Llanfihangel Aberbythych, Llanfihangel Rhos-Y-Corn, Llanfihangel-Uwch-Gwili, Llanfynydd, Llangathen, Maesteilo, Pontargothi and Taliaris.

[81] (Llandeilo, Maesteilo and Taliaris were originally part of a separate grouping and joined the Ministry Area later.

), Llanfair-Ar-Y-Bryn, Llangadog, Llansadwrn, Llansawel, Llanwrda, Manordeilo, Myddfai, Rhandirmwyn, Talley and Ystrad-Ffin.

[88] 1original dedication to SS Potolius & Notolius[90] This was formed by the union of the parishes of Burry Port, Llandyry, Pen-Bre and Pwll.

[92] This was formed by the union of the parishes of Capel Ifan, Cross Hands, Gors-Las, Llanedi, Llannon, Pont-Iets, Pontyberem, Saron, Tumble and Tycroes.

[97] This was formed by the union of the parishes of Abernant, Laugharne, Llanboidy, Llanddowror, Llanfihangel Abercywyn, Llangynin, Llangynog, Llan-Llwch, Llansteffan, Meidrim, Merthyr, St Clears and Tre-Lech A'r Betws.

[113] This was formed by the union of the parishes of Clunderwen, Clydau, Cyffig, Eglwys Gymyn, Lampeter Velfrey, Llanboidy, Llanddewi Velfrey, Llandysilio, Llanfyrnach, Llanglydwen, Llanmiloe, Llanwinio, Mynachlogddu, Narberth St Catherine and Whitland.

[138] As of September 2024 it was served by three Priests in Charge, one Assistant Curate and one Active Retired Non-Stipendiary Minister.

[159] This was formed by the union of the parishes of Castle Bythe, Dinas, Fishguard, Henry's Moat, Letterston, Little Newcastle, Llanfair Nant-Y-Gof, Llangolman, Llanllawer, Llanwnda, Llanychar, Llanychlwydog, Llys-Y-Fran, Maenclochog, Manorowen, Morfil, New Moat, Newport, Pontfaen and Puncheston.