Bolingbroke Castle

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Bolingbroke Castle is a ruined castle in Bolingbroke (or Old Bolingbroke) Lincolnshire, England.



Most of the castle is built of Spilsby greenstone, as are several nearby churches. The local greenstone is a limestone that proved to be porous, prone to rapid deterioration when exposed to weather and a substandard building material. The castle was constructed as an irregular polygonal enclosure. The castle is one of the earliest examples of a uniform castle designed and built without a keep. It originally was surrounded by a large water-filled moat 31 metres (102 ft) wide. The curtain wall was up to 5 metres (16 ft) feet thick and defended by five D-shaped towers and a twin-towered gate house.

Similar to another castle built by Ranulf during the same period at Beeston in Cheshire, Bolingroke had no inner defensive keep. The castle relied instead on thick walls and the five D shaped defensive corner towers. Some design similarities are noted with the contemporary castle at Boulogne-sur-Mer, France that was also constructed without a central donjon.


The area was first fortified by the Saxons in the 6th or 7th century. In the 12th century the Normans built a Motte-and-bailey on a nearby hill above the settlement of Bolingbroke.[1] The present structure was founded by Ranulf, Earl of Chester, in 1220 shortly after he returned from the Fifth Crusade.

Ranulf died in 1232 without a male heir, and his titles, lands and castles passed to his sisters. By 1311 Bolingbroke had passed through marriage into the ownership of John of Gaunt and the House of Lancaster.

In 1367, Henry IV, John's son, was born at Bolingbroke. Two years later his mother, Blanche of Lancaster, died from plague at the castle.

By the 15th and 16th century, the castle had fallen into disrepair although repairs were carried out during the Tudor period. In 1636 a survey found that all of the towers were effectively beyond repair.[1]

At the start of the First English Civil War, Bolingbroke was again put to use as a military fortification garrisoned by Royalist forces. In 1643 it was badly damaged in a siege during the Battle of Winceby. The following year, the castle was recaptured from the Parliamentarians but due to defeats elsewhere was relinquished again. In 1652 the castle was "slighted" to prevent any further use. The towers and walls were torn down and dumped into the moat.[1]

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