In 1299 the aging King Edward I remarried to Margaret of France, granting her Berkhamsted and Hertford castles, and he returned to Langley.

The young prince was enthusiastic about music, the arts, horse racing and kept a small menagerie, which included a lion and a camel, at Langley.

[6] Edward also removed his extensive collection of religious relics from the Tower of London and brought them to Kings Langley for safekeeping.

[15] The last evidence of the palace being used for official occasions was in 1476 when William Wallingford, Abbot of St Albans Abbey, held a banquet there for the Bishop of Llandaff.

John Russell, 1st Earl of Bedford, was given custody of the royal park at Kings Langley in 1538, one of many perquisites he accumulated at the court of Henry VIII.

The park was acquired by a wealthy lawyer, Sir Nicholas Bacon, Lord Keeper of the Great Seal of England and the builder of Old Gorhambury House near St Albans.

[16] During the reign of Charles I, Kings Langley royal park was cleared to make way for agriculture and tenant farmers cultivated the land.

Capell, a Royalist in the English Civil War, was executed in 1649, and the estate was granted to a Parliamentarian, Robert Devereux, 3rd Earl of Essex.

[18] In the late 17th century the expansion of the London population meant that landowners in the surrounding country were increasingly turning their land to agricultural use to meet the demand for food and animal feed.

The gatehouse and parts of the main building were still standing in 1591, and in his 1728 History of Hertfordshire, Nathanael Salmon states that "Here the rubbish of royalty exists" in reference to Kings Langley.

"[20] A description published by John Murray in 1895 reports that "at Kings Langley some outer walls only exist of the once royal palace, erected by Henry III.

Further records list the construction of a new gateway (1282–1283); a wine cellar (1291–1292); louvres for the roof of the hall built by a carpenter, Henry of Bovingdon; a stone wall enclosing the court (1296–1297); and the addition of new fireplaces in two "great chambers".

In 1440 bricks from le Frithe, near St Albans, were used to make fireplaces and ovens in the palace, possibly as part of repair works following the fire of 1431.