St Andrew Holborn was an ancient English parish that until 1767 was partly in the City of London and mainly in the county of Middlesex.
Its City, thus southern, part retained its former name or was sometimes officially referred to as St Andrew Holborn Below the Bars.
Earlier that century the small east stained-glass window was put up, representing the arms of John Thavie, Esq., who in the year 1348 "left a considerable estate towards the support of this fabric for ever" as its caption reads.
Under an Act of Parliament passed in the reign of Queen Anne and [related proceedings] the parish of St. George the Martyr, Queen Square, which before had formed part of St. Andrew's, Holborn, was erected into a distinct parish for spiritual purposes, although still united with St. Andrew's as regards the poor, and other secular matters.Four other new smaller parishes took over the largest green area depicted and most of Gray's Inn: Newcourt informs us that a public grammar school was among the adjuncts of the church.
[6] The ancient parish included most of the Holborn area to the west, bordering onto St Giles in the Fields.