1092 Bishop of Bangor

Hervey le Breton (died in 1131) was a Breton cleric who became Bishop of Bangor in Wales and later Bishop of Ely in England. He was appointed  Bishop of Bangor in 1092 by King William II of England. Bangor at the time was in the Kingdom of Gwynedd, which had recently been overrun by the Normans, and following the killing of Robert of Rhuddlan had been taken over by Hugh d'Avranches, 1st Earl of Chester. The appointment of Hervey was probably intended to further consolidate the Norman hold on the area.

1067 Chepstow Castle

Chepstow Castle (Welsh - Cas-gwent), located in Chepstow, Monmouthshire, in Wales, on top of cliffs overlooking the River Wye, is the oldest surviving post-Roman stone fortification in Britain and it was the southernmost of a chain of castles built along the English-Welsh border in the Welsh Marches. Its construction was begun under the instruction of the Norman Lord William FitzOsbern, soon made Earl of Hereford, from 1067. The castle ruins are Grade I listed as at 6 December 1950.

920 King of Deheubarth

Hywel Dda (English - Hywel the Good; or Hywel ap Cadell, c. 880 - 950) was a King of Deheubarth who eventually came to rule most of Wales. He became the sole king of Seisyllwg in 920 and shortly thereafter established Deheubarth, and proceeded to gain control over the entire country from Prestatyn to Pembroke. Hywel is highly esteemed among other medieval Welsh rulers. His name is particularly linked with the codification of traditional Welsh law, which were thenceforth known as the Laws of Hywel Dda. The office building and original home of the National Assembly for Wales is named Tŷ Hywel (“Hywel House” or “Hywel's House”) in honour of Hywel Dda.

844 Rhodri the Great

Rhodri ap Merfyn (Welsh - Rhodri Mawr, c. 820 - 878), later known as Rhodri the Great, succeeded his father, Merfyn Frych, as King of Gwynedd in 844. Rhodri annexed Powys c. 856 and Seisyllwg c. 871. He is called "King of the Britons" by the Annals of Ulster. In some later histories, he is referred to as "King of Wales", although the title is anachronistic and his realm did not include southern Wales.

720 Battle of Pencon

The Battle of Pencon or Pencoed was a battle won by the Britons. The Chronicle of the Princes places the battle in AD 720. The Annals of Wales are undated but Phillimore placed the following entry in the year 722. Castell Pen-y-Coed, an earthwork in Carmarthenshire, Wales has been suggested as the possible site of the battle of Pencon.

633 Battle of Heavenfield

The Battle of Heavenfield was fought in 633 or 634 between a Northumbrian army under Oswald of Bernicia and a Welsh army under Cadwallon ap Cadfan of Gwynedd. The battle resulted in a decisive Northumbrian victory. The Annales Cambriae (Annals of Wales) record the battle as Bellum Cantscaul in 631. Oswald was only to spend eight years upon the Northumbrian throne before he was defeated and killed by King Penda of Mercia at the Battle of Maserfield, in Shropshire. Oswald was succeeded as king of Northumbria by his brother Oswiu.

560 Synod of Brefi

The Synod of Brefi was a church council held at Llanddewi Brefi in Ceredigion and was followed by the Synod of Victory at Caerleon around 569. The synod was apparently called in order to condemn the heretical teachings of Pelagius, although this is far from certain. It was an important milestone in the rise of Saint David. Saint David (Welsh - Dewi Sant) was a Welsh bishop of Menevia during the 6th century. He was later regarded as a saint and is the patron saint of Wales.