Gelligaer is a town in Caerphilly, South Wales, in the Rhymney River valley. It is on the B4254 road between Treharris and Blackwood. Its estimated population as of 1985 was 16,900. Current industry includes automobile and rubber products manufacturing.
Gelligaer is known for its stone Roman fort, believed to have been built between 103 and 111 A.D. and excavated in the early 20th century. There is also an ancient standing stone north of the village.
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