Question: Whom was the sister of a prominent figure in the Restoration court and an influential friend of Queen Anne of Great Britain?
Sentence (from "Queen Anne (play)"): It is set between just before her accession in 1702 and her husband George's death in 1708 and centres on the relationship between Anne and her close friend Sarah, Duchess of Marlborough, by whom Anne was heavily influenced in the period before and during her reign.
Relevant evidence: No