Raglan, stately and handsome, is perhaps deceptive. The might of its angular towers bears comparison with the great castles of Edward I, and suggests its origins lay in the bitter conflicts of the later 13th century. In face it belongs mainly to the 15th century, and was as much a product of social aspiration as it was of military necessity. It was begun by Sir William ap Thomas, a veteran of the French wars, who grew wealthy through exploiting his position as a local agent of the duke of York in south-east Wales.

About 1435 he began building the Great Tower, subsequently known as the Yellow Tower of Gwent, probably on the site of a much earlier Norman motte-and-bailey castle. Surrounded by a water-filled moat, the unusual hexagonal plan of the tower, together with its elaborate drawbridge arrangements, are more easily paralleled in France than in Britain. Within, there was a single large room to each floor, and the entire structure echoed the power and influence of its builder.

Following ap Thomas's death he was succeeded by his son William Herbert who continued to develop Raglan. As a prominent Yorkist, he played a major role in securing the throne for Edward IV in 1461, and was raised to the peerage as Lord Herbert of Raglan. Eventually rising to earl of Pembroke, his political career is reflected in his sumptuous building. Under Herbert, Raglan became a veritable palace, unmatched in the 15th century southern March.

He added the great gatehouse, the Pitched Stone Court and also rebuilt the Fountain Court with a series of formal state apartments for himself and his household. All of these repay careful examination. Notice, for example, the circular gun ports in the lower part of the gatehouse. The great kitchen lay in the tower at the corner of the Pitched Stone Court, and its huge ovens and fireplaces remain.

Herbert was beheaded following his defeat at the battle of Edgecote in 1469, and there were no further major alterations to Raglan until the ownership of William Somerset, earl of Worcester (1548-89). In the main, he was responsible for extensive changes to the hall, which remains the finest and most complete of all apartments in the castle.

The huge fireplace survives, as does the tracery of the beautiful windows. These were once filled with heraldic glass, and the roof was built of Irish oak. Earl William also added the long gallery, without which no great Elizabethan house was complete.

At the outbreak of the Civil War, Raglan was garrisoned for the king. Henry, the new earl, and later marquess of Worcester, poured his fortune into the royal cause. By 1646 the castle was under siege, one of the longest of the Civil War. It was pounded by heavy artillery under the command of Sir Thomas Fairfax, and finally the elderly marquess was forced to surrender. The fall of Raglan virtually marked the end of the Civil War, and Cromwell's demolition engineers were soon at work reducing the great walls.

However, the strength of the Great Tower was almost great enough to defy them. Only after 'tedious battering the top thereof with pickaxes', did they eventually undermine the walls and two of its six sides were brought crashing down in a mass of falling masonry.

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