At the Tower of London
The great Norman keep at the centre of the fortress — begun around 1078, and the building that gave the Tower of London its name.
The White Tower is the oldest and most important building at the Tower of London. This is the original castle: the massive stone keep William the Conqueror began around 1078 to command the City of London and the river beside it. Everything else on the site grew up around it over the following centuries.
Rising about ninety feet over four floors, with walls up to fifteen feet thick at the base, the White Tower is one of the most complete eleventh-century keeps anywhere in the world. It was built of Kentish ragstone with imported Caen stone dressings, and at some point whitewashed — the coat of limewash that gave the building, and then the whole fortress, its name. Its corner turrets and thick walls made it both a fortress of last resort and a visible symbol of Norman authority over a conquered city.
On an upper floor sits the Chapel of St John the Evangelist, a rare survival: a plain, powerful Norman chapel of rounded arches and heavy columns, one of the oldest churches in London and largely unchanged since the eleventh century. It is one of the quietest and most atmospheric spaces in the whole Tower.
For centuries the White Tower stored the nation's arms, and today it houses displays from the Royal Armouries. The highlight is the Line of Kings, one of the world's longest-running visitor attractions, with royal armours — including pieces made for Henry VIII — displayed on carved horses. The building has also served as a royal residence, a records store and a prison across its long life.
The keep is traditionally credited to Gundulf, Bishop of Rochester, a noted builder brought in by William the Conqueror. Much of the fine dressing stone was Caen limestone, shipped across the Channel from Normandy — a deliberate echo of the Conqueror's homeland. Building on this scale took decades, and the White Tower was largely complete by around 1100. Its four levels have served, at different times, as royal apartments, a chapel, a great hall, storerooms and a garrison.
For much of its later life the White Tower was the headquarters of the Office of Ordnance, the body that supplied the Crown's guns and gunpowder, and it became the national store of arms and armour. That legacy survives in the Royal Armouries displays inside, and above all in the Line of Kings, which presents royal armours on carved wooden horses and has drawn visitors since at least the seventeenth century.
The name comes from colour, not stone. In 1240 Henry III ordered the whole keep to be whitewashed, inside and out, so that it gleamed above the city — and the name stuck even after the limewash faded. The building has been known as the White Tower ever since, and in time the name spread to the entire fortress that grew around it. Restoration and cleaning over the centuries have changed its exact appearance, but its silhouette of four corner turrets remains one of the most recognisable in London.
The White Tower is reached by a staircase and has stairs inside between its floors, so it is not step-free; visitors who need level access should plan around the accessible route. Give yourself time here — it rewards a slow look. For how the keep sits within the walls and towers around it, see the guide to the Tower's architecture and layout, and for the events it witnessed, the history of the Tower.