astonish a brace of emperors


Senior Member
Hi everyone
What is meant by "during which she will astonish a brace of emperors" in the following context from "Nights at the Circus" by Angela Carter:
Now all London lies beneath her flying feet; and, the very morning of this self-same October's day, in this very dressing-room, here, in the Alhambra Music Hall, among her dirty underwear, has she not signed a six-figure contract for a Grand Imperial Tour, to Russia and then Japan, during which she will astonish a brace of emperors?
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