Tri Hael Ynys Prydain, sef Mordaf ap Serfan, Rhydderch Hael a Nudd ap Senyllt

Ffurfiau: y Trihael, y Tri Hael, y Trihael, y Tri Haelion, y Tri Hael
Cyfeiriadau: 13.65n, 35.64, 43.12n, 43.50, 50.1n, 73.26n, 74.32

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