In lyste thries, and ay slayn his foo.

from Geoffrey Chaucer – The Canterbury Tales (General Prologue) on Rap Genius

Meaning

(= [he had fought] in three formal duels, and always slain his foe)

Formal duels between the leaders of Christian and Muslim armies were common into the 16th century. Evidently the knight was an able dueller, with a record of 3 and 0.

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