Andrew Marvell's 'The Garden'

I lived for some years on Highgate Hill in North London. A small statue of a black cat, protected from passers-by by a cage, supposedly marks the spot where Dick Whittington’s pet lingered, urging his master to turn back to become Lord Mayor of London - but further up the hill, I noted in my many walks to nearby Waterlow Park, there is set in the brick wall a bronze plaque that bears the following inscription (pictured above):

Four feet below this spot is the stone step, formerly the entrance to the cottage in which lived Andrew Marvell, poet, wit, and satirist; colleague with John Milton in the foreign or Latin secretaryship during the Commonwealth; and f