William Gurnall (1617-1679) born in Kings Lynn is probably best known for his three-volume book Christian in Complete Armour (1655, 1658, 1662), which is still in print published by Banner of Truth. He graduated from Emmanuel College, Cambridge, with a BA in 1635 and MA in 1639. He then became a curate in Sudbury and subsequently rector of St Peter and Paul's in Lavenham, Suffolk.
Some of Gurnall's works are here: http://www.prdl.org/author_view.php?a_id=1403
Some of his books are available to buy from Ossett Christian Bookshop here.