potency (n.)
power, authority, command
Cor II.iii.181 [Brutus to Citizens] arriving / A place of potency
H8 I.i.105 [Norfolk to Buckingham, of Wolsey] I advise ... you read / The Cardinal's malice and his potency / Together
KL I.i.172 [Lear to Kent] Our potency made good
MM II.ii.67 [Isabella to Angelo] I would to heaven I had your potency
TC IV.iv.96 [Troilus to Cressida] sometimes ... we will tempt the frailty of our powers, / Presuming on their changeful potency