Two castles can stand twenty miles apart, both grey, both ruined, both unmistakably medieval, and still belong to different worlds. One was built by an invader who needed to hold ground fast. The other was the work of a settled aristocracy who wanted comfort, display and a decent view. The quickest way to tell which is which is not the height of the walls. It is the shape of the arches.
Two Building Booms, Two Moods
Norman castle building in Britain follows the Conquest of 1066 and runs to roughly the end of the twelfth century. Speed mattered more than elegance. Earth-and-timber motte-and-bailey forts came first, then stone keeps and curtain walls, often on the same mounds. Openings were few, walls were thick, and decoration was concentrated around doorways where it could be seen.
Gothic arrives around 1190, first in cathedrals and abbeys, then in castles. Pointed arches, rib vaults, moulded stonework and much larger windows changed the look of everything. By the fourteenth century, castles such as Bodiam in Sussex or Herstmonceux were as much about status and comfortable living as about defence. That shift shows up in the stone.
Keep and Gatehouse: Where the Weight Sits
The signature Norman building is the keep, or donjon. Think of the White Tower in London, begun in the 1070s, or the great rectangular keeps at Rochester, Hedingham and Castle Rising. Four square walls, flat pilaster buttresses, small corner turrets, and a raised entrance reached by an external forebuilding with a straight stair. In the largest examples the walls are several metres thick at the base. The ground floor was often storage or a prison; the family lived above.
Gothic castles put their money into the gatehouse instead. Twin round towers flank a passage, with a portcullis or two, holes in the ceiling above the entrance, and rooms for the constable and his household on the upper floors. Harlech, Kidwelly and Dunstanburgh all reward a close look at the gate. Round towers were a deliberate improvement: no corners for a besieger to undermine, and missiles glance off a curved face.
The Easiest Test: Arches and Windows
Start with the arch and you will be right most of the time. A round-headed arch is Norman. A pointed arch is Gothic. The pointed form throws the weight of the wall down the sides rather than straight down, which allows wider and taller openings — the structural reason Gothic buildings feel lighter.
Round arch, squat window, flat buttress: Norman. Pointed arch, traceried window, moulded buttress: Gothic.
Norman openings
Windows are narrow, round-headed and deeply splayed on the inside, so a small exterior slit delivers a surprising amount of light to the room behind. Arrow loops are simple vertical slits cut through thick masonry. Doorways carry chevron, billet or nailhead mouldings, and often sit between pairs of slender shafts with plain cushion capitals.
Gothic openings
Lancet windows give way to windows with mullions and tracery, and later to broad Perpendicular openings filled with panel-like stonework. Arrow loops develop cross or fishtail shapes that give an archer a wider field of fire. Doorways gain moulded jambs, hood moulds and capitals carved with stiff-leaf foliage.
Decoration: Plain Strength Against Controlled Ornament
Norman wall faces are broad and relatively bare, punctuated by flat buttresses and simple string courses. Ornament clusters at the points a visitor passes: the doorway, the arch, the capital. Look for zigzag chevron patterns, scalloped capitals and heavy, wide mortar joints.
Gothic surfaces are busier. Buttresses step back as they rise, turrets finish in conical roofs, and crenellations often become decorative rather than practical. Blind tracery, diaper patterns and ballflower ornament appear on parapets and gate towers. The overall effect is vertical, sharp and deliberately intricate — architecture designed to be admired as well as defended.
Defensive Features That Changed Shape
- Arrow loops: plain slits in Norman work; cross, fishtail or keyhole shapes in Gothic work.
- Machicolations: projecting stone boxes with openings above a gate, so defenders could drop missiles straight down. Common on Gothic gatehouses and added to some older towers.
- Portcullis: a single gate in most Norman gateways; two or three set in sequence in Gothic ones, with a drawbridge and a bent passage.
- Ground plan: a square keep inside a rectangular bailey versus a concentric plan of round towers enclosing one another, as at Caernarfon, Harlech and Beaumaris.
- Entrance: an exposed straight stair to a raised first-floor door versus a barbican, a turn, a bridge and a series of gates.
A Quick Field Guide
- Look at the arch first. Round means Norman or Transitional; pointed means Gothic.
- Measure the windows by eye. Small and round-headed is early; large and traceried is late.
- Read the buttresses. Flat pilasters belong to Norman work; moulded buttresses with set-offs and flanking turrets belong to Gothic.
- Study the gate. One plain passage suggests an earlier date; twin towers, machicolations and multiple portcullis slots suggest the thirteenth century or later.
- Check the mortar joints. Thick beds of mortar and irregular rubble cores usually point to earlier building.
- Assume alteration. Castles were constantly updated, so a Norman keep may carry fourteenth-century windows, and a Gothic tower may sit on Norman footings.
Reading a Castle Without Guessing
Labels like Norman and Gothic describe a spectrum, not a switch. Transitional work of the late twelfth century happily mixes round and pointed arches in the same wall, and many castles were patched and extended for three hundred years. A single visit can take you through four building campaigns.
So take a slow lap before you photograph anything. Walk the outside of the curtain wall first and note where the masonry changes character. Stand in the gate passage and look up. Check whether windows were inserted into older stone, which is usually obvious from the way the surrounding courses are cut. If the site has a phasing diagram in its guidebook or on an information panel, compare it with what you noticed — that is where the real pleasure lies, in matching your own eyes to the evidence. And when in doubt, ask a steward. They know exactly which bits are nineteenth-century repairs, and they are usually delighted to point them out.
Photo: Wolf Art / Pexels
