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Abergwyngregyn is a village of historical note in Gwynedd, a county and principal area in Wales. Under its historic name of Aber Garth Celyn it was the seat of Llywelyn ap Gruffudd.
It is located at , adjacent to the A55, five miles (8 km) east of Bangor, eight miles (13 km) west of Conwy. Population 222.