The chancel was lengthened at the beginning of the thirteenth century and again at a more recent date, so that its architecture to-day is of three distinct periods. Outside may be seen five flat pilaster buttresses and one semi-circular one, a square-headed Roman doorway, a Saxon doorway and two Early English porches; and there is also a nearly circular panel on the south side of the nave, and a Norman squint at the west end. There are many other features of interest which bear evidences of a great antiquity, and the only question which is seriously disputed is whether the earliest portion of the present nave was built about the end of the Roman occupation of Britain or during the mission of S. Augustine. The Rev. Charles F. Routledge, M.A., F.S.A., Hon. Canon of Canterbury Cathedral, writes: "Whatever may finally be determined to be the date of the church's foundation, it can never lose its unique association with S. Augustine, King Ethelbert and Queen Bertha, nor its undisputed claim to be the oldest existing church in England. From it flowed the tiny spring of English Christianity, which has since widened out into a mighty river, and penetrated the remotest parts of the civilized and uncivilized world." [Side note: Other Early Churches.] Among other churches which show signs of having been built during the Roman occupation are those of Reculver, Richborough and Lyminge, while the foundations of an undoubted early church have been discovered in the old Roman city of Silchester, in Hampshire. _See frontispiece._ The old church at Reculver stood originally within the Roman castrum, the fortress which guarded the northern mouth of the Wantsume, now a small stream, but once an arm of the sea dividing the Isle of Thanet from the mainland. The greater part of this church was pulled down in 1809, but the western towers, known as "the sisters" were repaired by Trinity House, as they constitute a useful landmark for mariners, being visible at a great distance. Reculver church was built about A.D. 670, and from the existing walls and foundations it is clear that its plan was basilican. The church is now a ruin, but some stone pillars which supported the arches are preserved in the Cathedral Close at Canterbury. As Reculver guarded the northern mouth of the watercourse, so Richborough protected the south, and here traces of a chapel in the form of a cross are plainly discernible amongst ruins known to be of Roman workmanship. The old church at Lyminge in the same county is thus described by Canon Jenkyns, in his "_History of Lyminge_":--"The Roman foundations discoverable at the south-east angle of the chancel, together with the remarkable half-arch that intervenes, marked the site of the _aquilonalis porticus_--the title of basilica already given to it in the seventh century establishes its claim to great antiquity."