A later de Lacy, Robert, did not support Henry I in his struggle with his brother, so Henry confiscated the castle in the 1100s. Under Richard Lionheart, Roger de Lacy paid 3000 marks for the privilege of inhabiting the castle, but Richard still owned it. When Richard's brother John came to power, he awarded Roger's loyalty by giving him the castle. By this time it was being called Pontefract.
The de Lacy family lived there until the early 1300s, but Henry de Lacy had only one daughter, "Poor" Alice, who married Thomas, the 2nd Earl of Lancaster. Pontefract became a Lancaster possession now. Thomas backed the wrong horse in the never-ending conflict between kings and would-be kings. He was convicted of treason without being allowed to speak in his own defense and executed at Pontefract on 22 March 1322.
Pontefract then passed to Thomas' brother, Henry Grosmont, the 3rd Earl of Lancaster, who was politically more savvy and eventually became one of the most respected and land-wealthy nobles in England. With his death, Pontefract came to his son-in-law, John of Gaunt. John's son Henry Bolingbroke should have inherited it, but at John's death an annoyed Richard II kept it along with all the other properties that should have gone to Henry. Henry mounted a campaign to get back what was rightfully his, but it snowballed into an outright rebellion against Richard, who was deposed and held in the Tower of London for awhile before being sent to Pontefract for incarceration. Not long after, Richard was dead (we are told from starvation).
Richard III, after the death of King Edward IV, had two men beheaded at Pontefract: the son and brother of Edward's wife, Elizabeth Woodville. When Henry VIII accused his fifth wife, Catherine Howard, of adultery with Sir Thomas Culpeper, it was thought that the affair began when the king and queen were staying at Pontefract.
A parliament under Oliver Cromwell decided that Pontefract should be demolished and the materials re-used. Now it is possible to see the cellars, but some renovation has taken place.
Henry Grosmont was, as mentioned respected and wealthy, and his death was mourned throughout England. Let's talk about what made him special next time.