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Pettitt (eds) , Oxford: British Archaeological Reports British Series S448.
1992 'Radiocarbon dates from the Oxford AMS system: Archaeometry datelist 14', 34, 141–59. https://doi.org/10.1016/0883-2927(89)90025-5 Hedges, R. 1992 'Excavations of a Mesolithic site at Thatcham, Berkshire', 4, 249-54. Bats (eds) Internet Archaeology is an open access journal.The iconic stone effigy in the porch of Beaumaris church has traditionally been understood to depict Siwan, wife of Llywelyn ab Iorwerth, who died in 1237.