See the extracts from Chaucer's Book of the Duchess as compared with some from Machault's Remède de Fortune in Furnivall's Trial Forewords, p. 47, where he quotes from Étude sur G. Chaucer, by M. Sandras, p. 290. Or consult the Notes, in vol. i., to the Book of the Duchesse, ll. 155, 250, 634, 779, 805, 919, 950, 1037.
Observe particularly this rime of complain with plein. This shews whence Chaucer derived such rimes as seke, seke; Prol. 17, 18. There is a poem of 92 lines called Le Dit de la Harpe, printed in Bartsch's Crestomathie Française, p. 408, in which more than half the rimes are of this character.
It is none too clear who are meant by 'the parson and his companion.' Perhaps it means the Parson and the Ploughman (his brother).
Observe this substitution of one Tale for two, tacitly accepted by Chaucer's readers as better suiting the circumstances.
This statement, that the Frere was 'a grey frere,' is of some interest.