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International Society of Royal Descendants - Bloodroyal and Sangreal
Angharad Griffydd 
Baron William FitzMartin (Martin) - b: abt 1120 in Blagdon, Somerset or (b: 1135 in Dartingham, Devonshire)  d: 1208 & Ankaret Gruffydd (Angharad Griffydd b: in South Wales Angharad Ferch Yr Arglwydd Rhys - abt 1226)
daughter of:
Rhys Ap Gruffydd L Of Deheubarth (-1197) & Gwenllian Ferch Madog (-)
Rhys  & Gwenllian of Powys - daughter of:  Madog    (could be Prince Madoc Ap Mareduud of Powys & Susanna Verch Gruffydd who had another daughter :  Margaret Verch Madog of Powys b: abt. 1129 in Aberffraw, Anglsy, England who married: Prince Iorwerth Drwyndwn of Gwynedd (aka:the Broken-Nosed; Drwyndwn)  b: abt. 1125 in Aberffraw, Anglsy, England
Rhys was son of:
Gruffudd ap Rhys - d: 1137 & Gwenllian of Gwynedd
By about 1125, Gruffudd had entrenched himself in the upper reaches of Ystrad Tywi, where he awaited an opportunity to restore the authority of the house of Dinefwr in Dehubarth. He and his wife were killed during an attack against the English.    (His sister was  Princess Nesta verch Rhys of Dynevor  b:1073 d:1114  who was the 3rd wife of:  Henry I "Beauclerc" - King of England b: 1068 d: 1135
Gruffudd ap Rhys was son of:
Rhys ap Tewdwr Mawr - King of Deheubarth  & Gwladys verch Rhiwallon of Powys - daughter of: Rhiwallon   son of:   Cynfyn & Anghard - (This line continues)
Rhys assumed the kingship of Deheubarth in 1081 following the Battle of Mynydd Carn - at the same time that his distant relative, GRUFFUDD ap CYNAN (RIN 2575), his co-victor, assumed the kingship of Gwynedd and Powys. When WILLIAM THE CONQUERER (RIN 798) visited Wales in 1081 he recognized Rhys as ruler of Deheubarth. Rhys paid an annual tribute to WILLIAM. WILLIAM died in 1087. His son William Rufus allowed BERNARD of NEUFMARCH (RIN 1009), his vassal, to attack Deheubarth in 1088. Rhys was killed in 1093 trying to resist BERNARD's incursions. His son, GRUFFUDD, was taken to Ireland for refuge. The chroniclers in  both England and Wales saw the killing of Rhys as marking the end of kingship in Wales.
Rhys was son of:
Twedwr Mawr  & Gwenllian  - daughter of Gollwyn - son of: Ednywain  
Twedwr Mawr was son of:   
Cadell & Elinor  - daughter of: Gwerystan - son of: Gwaithfoed - son of: Gwynnan
Cadell was son of:    
Einion - He died two [four?] years before his father, so he never inherited his kingdom. His descendants, however did become rulers of Deheubarth.     
son of:   
Owain - King of Deheubarth - d: 0988  & Angharad - daughter of: Llywelyn
Owain became King of Deheubarth upon the death of his father HYWEL in 950. It was at his request that the Welsh genealogies and the Annales Cambriae were compiled. Owain's son, EINON, predeceased him in 984, but became the ancestor of the future line of rulers of Deheubarth. Meanwhile, the kingdom passed to his other son, MAREDUDD upon his death in 986.     
son of:
Hywel Dda ap Cadell - Prince of Deheubarth b: Abt 0887 in Dynevor Castle,Llandilo,Carmarthenshire, Wales - d: 0950 & Ellen Verch Llywarch b: Abt 893 in Dyfed, Wales Sources: Young; Llantarnam Abbey - daughter of: Llywarch ap Hyfaidd - King of Dyfed (Pembs. - son of: Hyfaidd
Hywel inherited Seisyllwg from his father, CADELL and became ruler     
of Dyfed when Llywarch ap Hyfaidd, his wife's brother died in 904. It is possible that Hywel had Llywarch killed. To these lands, apparently sometime around 930, he added Brycheiniog. This enlarged kingdom became known as Dehubarth. In 942 Hywel gained control of Gwynedd and Powys when his cousin IDWAL ab ANARAWD ap RHODRI (RIN 2582) was killed in a revolt against Wessex. This made him ruler of all Wales with the exception of Glamorgan in the souteast corner. Hywel, although sovereign, was in some way subject to the overlordship of the Kingdom of Wessex. Hywel's crowning achievement was his codification of the laws of Wales. It is for this that he probably was given the description "the Good" by his descendants. When Hywel died in 950, He passed the newly created kingdom of Dehubarth on to his son, OWAIN. Gwynedd and Powys were returned to the descendants of his cousin, IDWAL (see above).     
Hywel was son of:
Cadell - d: 0910 in Wales - He inherited the kingship of Seisyllwg from his father RHODRI. When it became apparent the the King of Wessex, ALFRED THE GREAT (RIN 1338), was gaining the upper hand against the Danes, Cadell and his brother, ANARAWD, King of Gwynedd and Powys, submitted to some sort of overlorship by ALFRED.     
son of:
Rhodri Mawr - King of Gwynedd d: 0877 in Anglessy, Wales      
Bartrum's "Welsh Genealogies".  Upon the death of his father in 844 he became King of Gwynedd. When his uncle, Cyngen, died in 855 he became King of Powys. When his wife ANGHARAD's brother, Gwgon, died in 871 he also became ruler of Seisyllwg. By the time of his death in 877 he ruled over all of Wales with the exception of the southeastern and southwestern extremities. Rhodri was a pivotal person in Welsh history. In future centuries, one of the main requirements for kingship in the Welsh kingdoms was being of the descent of Rhodri Mawr.     
Rhodri's fame sprang from his success as a warrior. It was his victory over the Viking, Horn, leader of the Danes, in 856 which brought him     
international acclaim. The Irish and the Franks had been unsuccessfully trying to repel the Northmen and they were impessed by Rhodri's success. The English kingdom of Wessex had for many years been striving with partial success to subjugate Powys. It was in battle against the English that Rhodri, along with his son, Gwriad, was killed in 877. It appears that the Welsh court experienced a cultural revival during the reign of Rhodri.     

Stewart Baldwin posted to soc.genealogy.medieval on 29 Jun 1997 (in part):     
Subject: Re: Rhoderic Mawr, King of Wales     
"Rhodri Mawr, king of Gwynedd, died in 878. ["Rhoderic" is an Anglicization of the Welsh name "Rhodri".] Although he was an important Welsh king, it is not really appropriate to call him the "first King of Wales", for there were large parts of Wales over which  he did not rule. Most sources give the name of Rhodri's wife as ANGHARAD, heiress of Ceredigion, and give his mother as NEST, heiress of Powys, but Patrick Sims-Williams [in the article "Historical Need and Literary Narrative: a Caveat from Ninth-Century Wales", Welsh History Review, vol. 17 (1994), pp. 1-40] has recently argued (conclusively, in my opinion) that neither NEST nor ANGHARAD ever existed, and that they were inventions of later genealogists who wanted to give Rhodri's family a line of descent from the earlier kings of Powys and Ceredigion. Rhodri's ancestry, as taken from the best records (The Harleian genealogies and the Welsh and Irish annals), is given in this genealogy. Names are given here in their Old Welsh forms, with Modern Welsh ["MW"] forms given in brackets.  

According to legend, the first Dinefwr Castle (right) was built by Rhodri Mawr - King of Wales in the 9th century. It is unavoidable that attention should focus on those Welsh rulers who extended their power over much of Wales in the centuries prior to the Norman conquest. They foreshadowed the attempts by the princes of Gwynedd in the 13th century to create a unified Welsh state, and they matched contemporary developments in England, and similar, but later, developments in Scotland. So, Rhodri Mawr (844-78) is presented as one who set a pattern for the future. He either ruled or, by his personal qualities, dominated much of Wales.     

Chroniclers of his generation hailed Rhodri ap Merfyn as Rhodri Mawr (Rhodri the Great), a distinction bestowed upon two other rulers in the same century - Charles the Great (Charlemagne, died 814) and Alfred the Great (died 899). The three tributes are of a similar nature - recognition of the achievements of men who contributed significantly to the growth of statehood among the nations of the Welsh, the Franks and the English. Unfortunately, the entire evidence relating to the life of Rhodri consists of a few sentences; yet he must have made a deep impression upon the Welsh, for in later centuries being of the line of Rhodri was a primary qualification for their rulers. Until his death, Rhodri was acknowledged as ruler of more than half of Wales, and that as much by diplomacy as by conquest.     
Rhodri's fame sprang from his success as a warrior. That success was noted by The Ulster Chronicle and by Sedulius Scottus, an Irish scholar at the court of the Emperor Charles the Bald at Liege. It was his victory over the Vikings in 856 which brought him international acclaim. Wales was less richly provided with fertile land and with the navigable rivers that attracted the Vikings, and the Welsh kings had considerable success in resisting them. Anglesey bore the brunt of the attacks, and it was there in 856 that Rhodri won his great victory over Horn, the leader of the Danes, much to the delight of the Irish and the Franks.     

It was not only from the west that the kingdom of Rhodri was threatened. By becoming the ruler of Powys, his mother's land, he inherited the old struggle with the kingdom of Mercia. Although Offa's Dyke had been constructed in order to define the territories of the Welsh and the English, this did not prevent the successors of Offa from attacking Wales. The pressure on Powys continued; after 855, Rhodri was its defender, and he and his son, Gwriad, were killed in battle against the English in 878.     
son of:
Merfyn Frych - King of Gwynedd - Death: 844 in Battle of Cyfeilioy, Wales & Nest    
son of:
Gwriad - King of the Isle of Man - b: in Isle of Man, England  & Esyllt    
"Gwriad, probably from the Isle of Man, and possibly the person named on an inscription ("CRUX GURIAT") on a cross in the Isle of Man which has been dated to the eighth or ninth century. [Note: The genealogy which purports to make Gwriad a direct male-line descendant of Llywarch Hen is almost certainly a late fabrication. It is more likely that his paternal ancestors were among those who are named in HG.4, but the exact line of descent (if any) is uncertain, and Gwriad's parentage must be regarded as unknown. See SW for a discussion of these issues. See also GH.]"     
. Source abbreviations:     
. HG = Genealogies from Harleian MS. 3859, fo. 193r-195r, edited in EWGT, pp. 9-13 (a copy made ca. 1100 of genealogies compiled probably between 954 and 988)     
. GH = Bedwyr L. Jones, "Gwriad's Heritage: Links between Wales and the Isle of Man in the Early Middle Ages", Transaction of the Honourable Society of the Cymmrodorion (1990), 29-44.     
. EWGT = Early Welsh Genealogical Tracts, edited by P. C. Bartrum (University of Wales Press, Cardiff, 1966).     
. SW = Patrick Sims-Williams, "Historical Need and Literary Narrative: a Caveat from Ninth Century Wales", The Welsh History Review 17     
(1994), 1-40.  
son of:  Elidir    
son of: Sandde & Celeinion    
son of:  Alcwn    
son of:  Tegid    
son of: 
Gwair - Turton's "Plantagenet Ancestry" shows his wife as Anna - sister of King Arthur but this appears to be due to confusion with another Gwair.     
son of: Dwg    
son of: Llywarch Hen - King of Rheged    
son of:  Elidir Lydanwyn - King of Rheged & Gwawr    
son of:  Meirchion Gul - King of Rheged    
son of:  Gwrwst Ledlwm - King of Rheged    
son of:  Ceneu - King of North Britain    
son of:  Coel Hen Godenbog - King of North Britain  & Ystradwal