Meurig ab Arthfael
thumb|upright=1.3|Map of medieval south-east Wales, fifth to thirteenth centuries. The number "9" west of Gwent is listed in the map legend as Morgannwg, which superseded Glywysing as the name for the kingdom at the end of the tenth century.|alt=Map of south-east Wales
 (or Mouric, ruled ) was a king in south-east Wales. In the seventh century, Gwent was a single kingdom covering south-east Wales, but in the ninth century it was divided between Glywysing (Glamorgan), which had a higher status, and a smaller Gwent, covering the area which is now Monmouthshire. Historians disagree whether  was king of Glywysing, with authority across south-east Wales, or only of Gwent. His sons  and  were only kings of Gwent, and they were subject to their cousin Hywel ap Rhys, King of Glywysing.

The twelfth-century Book of Llandaff records charters in which Meurig granted land to the church or guaranteed grants by others. Two charters state that he ordered all churches were to be free from obligations to laymen, and in the view of the historian Wendy Davies, he was one of the few kings who attempted to guarantee ecclesiastical immunity from widespread lawlessness and arbitrary use of power. Historians disagree about his death date. Some date it definitely as 874, but others think that the Meurig whose death is recorded in 849 is also possible.

Background
The boundaries and names of Welsh kingdoms varied over time in the early medieval period. In the seventh century, south-east Wales was a single kingdom called Gwent, but historians of Wales do not agree on the situation in the ninth century, when some kings made grants in locations across the territory, while others were confined to the eastern part. Thomas Charles-Edwards thinks that the old Gwent was divided between Glywysing (later Morgannwg and then Glamorgan) in the west and a smaller Gwent (now Monmouthshire) in the east, with the ruler of Glywysing being an over-king. Wendy Davies argues that it is more likely that the old Gwent remained a single kingdom now called Glywysing. Patrick Sims-Williams thinks that either may be true, and that they "may amount to the same thing".

Kingship
The main sources for King  are charters recorded in the twelfth-century Book of Llandaff. Much of this book is fraudulent, and until the late twentieth century most historians dismissed it as worthless, but since the work of Davies on the charters in the 1970s, they have been reappraised, and while some are judged to be forgeries, others are regarded as genuine in whole or part. However, they are undated, and it is not always clear which  is being referred to. Confirmation that  and his sons,  and , ruled in the ninth century is provided by their notice in two independent sources. Asser in his biography of Alfred the Great mentions " and  (sons of  and kings of Gwent)", and charter 199bii is a grant by King , witnessed by his sons  and .

Davies dates 's reign as . Almost nothing is known of history in south-east Wales immediately before his time as his reign follows a gap in the Llandaff charters of some fifty years. His predecessor as king was probably his second cousin, Ithel ab Athrwys, who was killed in battle in 848 and was apparently the last of his line. According to a Harleian genealogy, Meurig was a son of .

Davies locates 's grants across Glywysing and Gwent, and she and Charles-Edwards state that he ruled both territories as king of Glywysing. Charles-Edwards suggests that he and his brother  probably ruled Glywysing successively. Sims-Williams dissents, arguing that in the only charter placing  in Glywysing, his name was later interpolated, and that he had no power outside Gwent. Rhys ab Arthfael's son Hywel ap Rhys was king of Glywysing, and his cousins, 's sons, had an inferior status as kings of Gwent.

Charters
thumb|upright=1.2|Folio from the Book of Llandaff|alt=Page from the Book of Llandaff
Medieval Welsh kings owned large landed estates, and a charter in the Book of Llandaff records a grant by  to the church. In about 868, he surrendered the church at Tryleg to Bishop Cerennyr in charter 199bii.

Around 850, charters 169b and 170 state that  ordered that all churches were to be released from obligations to laymen. Davies comments that the Llandaff charters give an "impression of lawlessness and of the arbitrary use of royal power by those who held it." In her view,  is one of the few exceptions, as he seems to have attempted to protect ecclesiastical immunity, but he cannot have been wholly successful as charters continued to grant churches in the tenth and eleventh centuries.

Several charters approved by  record grants by laymen to ecclesiastics. Two dated to around 850 record grants to Bishop Grecielis with Meurig's guarantee. In charter 169b, Fauu gave Cilpedec (Kilpeck) church with its land, and in charter 170 Cuinncum returned Cum Mouric (Little Dewchurch?) church to the bishop. In charter 74 dating to around 860,  consented to a grant by Britcon and Iliwg of Lann Mocha (St Maughans) to Archbishop Dyfrig's church, but in another version (171b) of the charter  guaranteed their grant of Lann Bocha to Bishop Grecielis, and it is not clear which version is genuine.

Death
Historians of Wales do not agree when  died. Charles-Edwards thinks that he may be the  whose death is recorded in the  under 849, but Bartrum states that his death is recorded in 874 (in the Annales Cambriae for 873, recte 874). Davies argues that "the claims of the relative chronology of the witness sequence are such as to suggest that , the King  of grants 169b-171b, 199bii (214?), 216b, 225 died in 874 rather than 849". Sims-Williams mentions both dates as alternatives. The royal line descended from  appears to have ended with .

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Category:9th-century Welsh monarchs