In Search Of London's Vanished Castles
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London’s Lost Castles and Fortifications

As the old adage goes, an Englishman’s home is his castle. But where are London’s actual castles? Even the most fresh-off-the-boat tourist could not fail to notice that the Tower of London is central London’s sole surviving bastion; however, throughout the ages, several castles and fortifications have existed within inner London.

5 Baynard’s Castle

Baynard’s Castle refers to two buildings that existed on the same site between St Pauls Cathedral, where the old Roman walls and River Fleet met the River Thames, just east of what is now Blackfriars station. The first was a Norman castle, constructed by Ralph Baynard (Sheriff of Essex) that incorporated an earlier Saxon fortification.

The castle was inherited by Ralph’s son Geoffrey and his grandson William Baynard, but the latter forfeited his lands early in the reign of Henry I (1100–1135) for supporting Henry’s brother Robert Curthose in his claim to the throne. John Stow gives 1111 as the date of forfeiture. Later in Henry’s reign, the lordship of Dunmow and honour or soke of Baynard’s Castle were granted to the king’s steward, Robert Fitz Richard.

The Norman castle stood for over a century before being demolished by King John in 1213. It appears to have been rebuilt after the barons’ revolt, but the site was sold in 1276 to form the precinct of the great priory of Blackfriars. About a century later, a new fortified mansion was constructed on land that had been reclaimed from the Thames, southeast of the first castle.

The castle was rebuilt after 1428 and became the London headquarters of the House of York during the Wars of the Roses. Both King Edward IV and Queen Mary I of England were recorded being crowned at the castle.

By the end of the 15th century, the castle was reconstructed again as a royal palace by Henry VII, which Henry VIII gave Catherine of Aragon as a gift on the eve of their wedding. Baynard’s Castle was left in ruins after the Great Fire of London in 1666, although fragments survived into the 19th century.

Baynard’s Castle
Baynard’s Castle
Engraving of Baynard's Castle by A. Birrell.
Engraving of Baynard’s Castle by A. Birrell.

4 Ruislip Castle

Ruislip Castle is an 11th-century motte and bailey castle located in Ruislip in Greater London. A timber castle would have stood on the raised motte (mound), beyond would have been a bailey (fortified enclosure) containing a cluster of huts that was introduced by the Normans as a means to subdue and administrate local populations. Both would have been surrounded by a palisade and moat, part of the moat still survives today.

The castle was probably occupied for a very short period as there’s no record of Ruislip Castle in the Domesday book, however, groundwork on the site has been dated to the 9th century.

Ruislip Castle
Ruislip Castle
Ruislip Castle
Ruislip Castle

3 Roman Fort (CE 120)

In succession to the temporary fort, a stone fort was built around CE 120, just north-west of the main population settlement. It covered 12 acres and was almost square in size and 200m along each length. As Londinium grew, the fort was later absorbed into the defensive wall that surrounded the city and could house up to 1000 men with suitable barracks and gated entry.

A century later, the site was decommissioned as the military situation in the southern edge of Britannia had become more secure. Today, the forts northern and western edges still remain visible, along with Saxon fortifications and medieval bastion towers as part of the Barbican and Museum of London complex.

Roman Fort (CE 120)
Roman Fort (CE 120)
Roman Fort (CE 120)
Roman Fort (CE 120)

2 Post-Boudican Roman Fort (CE 65-80)

The first post-Boudican fort was built at Fenchurch Street in response to the tribes of Britons revolting against Roman rule.

In CE 60 or 61, whilst the Roman governor Gaius Suetonius Paulinus was leading a campaign on the island of Anglesey off the northwest coast of Wales, the Iceni Queen Boudica, led a coalition of native tribes in a march across Britannia that led to the total destruction of Londinium.

In response, a fort was built in the Early Roman period (CE 65-80) around the site of 20 Fenchurch Street as a temporary structure. Excavations by the Museum of London at Plantation Place uncovered the north-east corner of the temporary fort and created a reconstruction plan based on these findings. Possible fort-related features include clay-and-timber buildings, a large timber-lined water tank, and a metalworking workshop.

1 Roman Wall

The London Wall is a defensive wall that encircled the City of London. The wall was built between 190 and 225 CE, it continued to be developed by the Romans until at least the end of the 4th century, making it among the last major building projects undertaken by the Romans before Britannia looked to its own defences in CE 410.

Along with Hadrian’s Wall and the road network, the London Wall was one of the largest construction projects carried out in Roman Britain. Once built, the wall was 2 miles long and about 6m high, encircling the entire Roman city. Despite Londinium being abandoned and left to ruin, the wall remained in active use as a fortification for more than another 1,000 years.

It was repaired when Anglo Saxon rule was returned to London by Alfred the Great during a period of Viking sieges and raids, where he carried out building projects to rebuild crumbling defenses, recut the defensive ditch (Roman fossa that encircled the walls of Londinium) and founded the re-settlement of Lundenburg within the walls.

The wall was further modified in the medieval period, with the addition of crenellations, gates and bastion towers. This formed part of a defensive line that incorporated The Tower of London, Baynard’s Castle and Montfichet’s Tower.

It was not until as late as the 18th and 19th centuries that the wall underwent substantial demolition, although even then large portions of it survived by being incorporated into other structures. Amid the devastation of the Blitz in WW2, some of the tallest ruins in the bomb-damaged city center were actually remnants of the Roman wall.

Roman Wall
Roman Wall
Roman Wall
Roman Wall

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John Smith has been with Histecho since 2017, A Senior Editor & Writer for Histecho. his work has been featured in outlets such as Scientific American, The Washington Post, NBC News, and Fox News. John grew up outside of Philadelphia and studied biology at Hamilton College in upstate New York.