Castlemartin was a hundred in Pembrokeshire, Wales. Initially created by the Marcher Lords of Pembroke in the 14th century from the western part of the pre-Norman cantref of Penfro, it was confirmed by the Act of Union of 1536 . The hundred, with its capital at Pembroke was early settled by English and Scandinavians, and was a centre of the Norman/English "plantation" in the 12th century. Since then it has been entirely English-speaking , and part of Little England beyond Wales.

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