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Dwellinge a lord of greet auctoritee,
A gret devyn that cleped was Calkas,
That in science so [expert] was, that he
Knew wel that Troye sholde destroyed be,
By answere of his god, that highte thus,
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Daun Phebus or Apollo [Delphicus].
11. So whan this Calkas knew by calculinge,
And eek by answere of this Appollo,