John Howard was a grandson of Thomas de Mowbray and inherited the castle in 1476 but not the dukedom which reverted to the Crown. However, after the sudden death of Edward IV and the accession of Richard III, Howard was awarded the recreated title 1st Duke of Norfolk.
The 1st Duke was killed at the Battle of Bosworth Field fighting alongside Richard III and thereby forfeited his title and estates to the new king, Henry VII.
John's son, Thomas Howard, served Henry VII loyally and was restored to his title of duke (2nd Duke) and his property in 1514. When he died in 1524 his son Thomas Howard became 3rd Duke and inherited Framllngham.
During the reign of Henry VIII the Howard's were closely connected to the royal family - Catherine Howard (the 3rd Duke's niece) became Queen of England in 1540 but after she was executed for treason only sixteen months later the Howard's fell from favour. In 1546 the 3rd Duke was arrested but was released when Henry VIII died in 1547. The 3rd Duke died in in 1554 and was succeeded by his grandson, Thomas Howard, the 4th Duke.
The 4th Duke was suspected of being part of a Catholic plot and was executed for treason for conspiring against Elizabeth I in 1572. The Norfolk title and lands were forfeit once again.
After the death of Elizabeth I in 1603 the Howards were immediately restored to much of their lands (including Framlingham) and later, following a petition in the House of Lords, to their title of Duke of Norfolk in 1660. However, the family were in poor financial circumstances and had sold the castle at Framlingham to a private buyer (Mr. Hitcham) in 1635.
The Howard family continue to hold the titles Duke of Norfolk, Earl of Surrey and Earl Marshal of England. The 18th Duke is Edward Fitzalan-Howard (since 2002).