Borrowed from Old French covent, French couvent.
covent (plural covents)
- (obsolete) Convent.
c. 1500, Anonymous, A Chronicle of London from 1089 to 1483:
And in this yere deyde Huberd erchebisshop of Caunterbury; and thanne the priour and the covent of Caunterbury chosen in there chapytre hous the noble clerk Stephen of Langeton, ayens the kynges will, whome the pope sacred at Viterke.
(Can we date this quote?), Christopher Marlowe, The Jew of Malta:
BARABAS. Marry, the Turk  shall be one of my godfathers, But not a word to any of your covent.