trwtan, trwdlan, [592].

Trwtyn-Tratyn, 229, [592], [597], [694].

Trwyd, [541]: see Trwyth.

Trwyn Swch, [693].

— Swncwl, 278: see Bwlch T. S.

Trwyth, [541], [544].

Tryfan, [580].

Tuan mac Cairill, [611], [615], [618], [620], [621].

Tuatha Dé ocus Andé, [637].

— Dé Danann, [454], [544], [548]–50, [554], [685].