Sir Gammer Vans

Can any one give any account of a comic story about one "*Sir Gammer Vans*," of whom, amongst other absurdities, it is said "*that his aunt was a justice of peace, and his sister a captain of horse*"? It is alluded to somewhere in Swift's *Letters* or *Miscellanies*; and I was told by a person whose recollection, added to my own, goes back near a hundred years, that it was supposed to be a *political satire*, and may have been of Irish origin, as I think there is some allusion to it in one of Goldsmith's plays or essays.