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Seisyllwg
Seisyllwg was a petty kingdom of medieval Wales.〔Davies, p. 85〕 It is unclear when it emerged as a distinct unit, but according to later sources it consisted of the former Kingdom of Ceredigion plus the region known as Ystrad Tywi. Thus it covered the modern county of Ceredigion, part of Carmarthenshire, and the Gower Peninsula. It is evidently named after Seisyll, king of Ceridigion in the 7th or early 8th century, but it is unknown if he was directly responsible for its establishment. In the 10th century Seisyllwg became the center of power for Hywel Dda, who came to rule most of Wales. In 920 Hywel merged Seisyllwg with the Kingdom of Dyfed to form the new kingdom of Deheubarth.
==Origins==
It is unclear when Seisyllwg emerged as a distinct unit. It is assumed to have been named for Seisyll, King of Ceredigion in the 7th or early 8th century, and as such he is traditionally regarded as its founder.〔Lloyd, p. 257 and note.〕 Seisyll appears in the Harleian genealogies for the Kings of Ceredigion,〔(Harleian genealogy 26 ).〕 but no early sources attribute the foundation of Seisyllwg to him, and the name Ceredigion continues to be used into the 9th century.〔Koch, p. 1602.〕 The name Seisyllwg appears in some later sources, such as the Book of Llandaff, the Welsh Triads, and the Welsh laws, the latter of which describes it as one of the three principal subdivisions of South Wales, along with Morgannwg and ''Reinwg'' (probably Dyfed).〔〔Jones, pp. 61–62.〕 However, the first clear description of the territory is in the First Branch of the Mabinogi, where Seisyllwg is said to include the four cantrefs of Ceredigion plus the three of Ystrad Tywi, a description which accords with that in the laws.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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