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A kistvaen or cistvaen is a tomb or burial chamber formed from flat stone slabs in a box-like shape.
The name of Ty- Illtyd, or St. Illtyd's house, is still known as Llanamllech, but it is applied to one of those monuments of Druidical antiquity called a cistvaen, erected upon an eminence named Maenest, at a short distance from the village.