a son escient

Middle French

Adverb

a son escient

1. to one's knowledge; to the best of one's knowledge
   • 1488, Jean Dupré, Lancelot du Lac, page 59:

     Beaux seigneurs vous scavez bien que la coustume de ceans est telle que nous devons eslire cellui a nostre escient qui le mieulx a fait au tournoiement.

     Good sirs, you know very well that our custom is that we have to choose who, to the best of our knowledge, has performed the best in the tournament.

References

• escient (subsection B. 1.) on Dictionnaire du Moyen Français (1330–1500) (in French)