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A cantref was an obsolete Welsh territorial unit, essentially a hundred. These units were composed of a hundred trefs, which were townships. The kingdoms of Wales were historically divided into these cantrefs for administrative purposes. Over time, particularly in the 12th century, the cantref was largely replaced by a smaller administrative unit called a commote. The cantref system, along with maenors (larger landholdings), formed the basis of early Welsh society and administration before the Norman invasions.123

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