The House of Aberffraw was a medieval royal court based in the village it was named after, Aberffraw, Anglesey (Wales, UK) within the borders of the then Kingdom of Gwynedd. The dynasty was founded in the 9th century by a King in Wales whose descendants founded the Welsh Royal Houses. The other medieval Welsh dynasties were the Royal Houses of Dinefwr, Mathrafal.
The Royal House is deemed to be a historiographical and genealogical term historians use to illustrate the line of succession from Rhodri the Great of Wales through his eldest son Anarawd. The last member of the male line of the house of aberffraw was Owain Lawgoch.
Aberffraw hundred (cantref)
The name of the royal house derives from Aberffraw, on Anglesey (Ynys Môn) at the mouth of the River Ffraw. The royal court is where the early Kings of Gwynedd established their principal (chief) family seat. The site was a preshistoric settlement later occupied during the Roman period (). The town became a Welsh Princely court () and location of a royal palace as part of the administrative centre and one of the three county divisions (hundred, ) of Anglesey. An early Gwynedd King, Cadfan ap Iago was buried at St. Cadwaladr's Church in the then Aberffraw hundred. Cadfan's tombstone (634 AD) is on display in the church today and reads:
Welsh dynasties
In the 9th century, Rhodri the Great () had inherited multiple Welsh Kingdoms, Gwynedd from his father Merfyn Frych (Manx Chieftain), Powys from his mother Nest and he added Seisyllwg (Ceredigion and Ystrad Tywi) by a dynastic marriage to Angharad of Seisyllwg. Rhodri divided Wales into at least 3 provinces, his son Anarawd ap Rhodri was given the Kingdom of Gwynedd and founded the medieval dynasty the House of Aberffraw. Merfyn ap Rhodri was given the Kingdom of Powys. And another of Rhodri's sons, Cadell ap Rhodri was given the province of Deheubarth and began the House of Dinefwr. Wales was subsequently separated into North Wales, Mid Wales and South Wales respectively.
Succession
Royal succession within the House of Aberffraw (as with succession in Wales in general) was a complex matter due to the unique character of Welsh law. According to Hubert Lewis, though not explicitly codified as such, the edling, or heir apparent, was by convention, custom, and practice the eldest son of the lord or Prince and was entitled to inherit the position and title as "head of the family" from the father. This was effectively primogeniture with local variations. However, all sons were provided for out of the lands of the father, and in certain circumstances so too were daughters (with children born both in and out of wedlock considered legitimate). Men could also claim royal title through the maternal patrimony of their mother's line in certain circumstances (which occurred several times during the period of Welsh independence). The female line of the dynasty was also considered to remain royal, as marriage was an important means of strengthening individual claims to the various kingdoms of Wales and uniting various royal families to that of Aberffraw, or reuniting factions after dynastic civil wars (for example with the marriage of Hywel Dda, a member of the Dinefwr branch of the Aberffraw dynasty, and Elen of Dyfed, daughter of Llywarch ap Hyfaidd, King of Dyfed). This meant that the female line was considered as a legitimate path of royal descent within the House of Aberffraw, with the claims of royal women to titles usually transferring to their sons.
Cambro-Norse era
During the Cambro-Norse era (850s1100s), Wales was subjected to Viking raids all throughout the country between 852 and 919 (the Jómsvíkinga saga refers to that period). An example of this pattern was with the Viking leader Ingimund who was expelled from Dublin and tried unsuccessfully to establish a base on Anglesey (), but instead left for Chester.
The Welsh Kingdoms had been subject to the Kingdom of Mercia from the 7th century onwards. This led to the construction of Offa's Dyke, a territorial land border between England and Wales built in the mid to late 8th century. However, war broke out against the English for decades from 853, this culminated in a victory for The Welsh Kingdoms of Gwynedd and Powys against the English Mercian and Wessex Kingdoms who had been assisted by Anglo-Saxons and Danes (Vikings).