#AddoldaiDyddGwener

Abaty Tyndyrn oedd y fynachlog Sistersaidd 1af yng Nghymru, sefydlwyd gan Walter fitzRichard o Clare 1131. Y preswylwyr cyntaf oedd grŵp o fynaich a ddaeth o'r fam-fynachlog l'Aumone, ac dechreuwyd
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