Cantref

[2] The word cantref is derived from cant ("a hundred") and tref ("town" in modern Welsh, but formerly used for much smaller settlements).

The antiquity of the cantrefi is demonstrated by the fact that they often mark the boundary between dialects.

The cantref court dealt with crimes, the determination of boundaries, and inheritance.

Cantre'r Gwaelod is an ancient sunken kingdom said to have occupied a tract of fertile land lying in Cardigan Bay.

In one version of the story, Seithenyn, a prince of the kingdom, is a notorious drunk and it was through his negligence that the sea swept through the open floodgates, flooding the land forever.