Login to access Yr ymarfer o dduwioldeb: [electronic resource] : yn cyfarwyddo dŷn i ryngu bodd Duw: / yr hwn lyfr â ofodwyd allan yn saeson-aec o waith y gwir barchedig dâd Lewis escob Bangor, ac a gyfieithwyd yn gamber-aec o waith Row. Vaughan o gaergai o fîr feirion wr bonheddig.

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