While this could not fairly be described as an either/or question, you could be forgiven for getting confused between Mistresses Ford, Page and Quickly.
Mistress Ford and Mistress Page – two wealthy married women – are the title characters in The Merry Wives of Windsor, in which Mistress Quickly is a relatively minor character; she is listed as "a servant to Doctor Caius". Doctor Caius is a French physician, whom Mistress Page favours as a potential husband for her daughter.
Mistress Quickly also appears in Henry IV Parts 1 and 2, and Henry V, although she appears to be a very different character. It's in these three plays that she is described as the "hostess" of the Boar's Head, which is a favourite haunt of Sir John Falstaff and his disreputable cronies. (I haven't seen or read any of the four plays myself, but the Boar's Head is not mentioned in Wikipedia's page about The Merry Wives.)
All four plays are believed to have been written between 1596 and 1599. The Merry Wives is possibly the earliest of them, although it wasn't published until 1602. It may have been written around the same time as Henry IV Part 1, and probably precedes Henry IV Part 2 and Henry V.
© Macclesfield Quiz League 2019