[1] In February 1300/1 his son John Hastings (1262–1313), Baron Bergavenny, had licence to crenellate his "manor and town of Fillongley in Warwickshire".

The manor house was still standing during the reign of Edward III (1327–1377), but was unoccupied by the de Hastings.

In 1389, it passed to the Beauchamp family holding the Earl of Warwick title and was repurposed into a manor house during the 14th century before being abandoned during the 15th century,[6] with stone from the castle being used to repair buildings within the village of Fillongley.

[6] Most of the surviving ruins of Fillongley Castle have remained unchanged since at least the 19th century and have been owned by Bonds Hospital Charity since 1980.

[7] The site of the castle had become overgrown by c. 2012, so the ruins were sprayed with Murcam, which also led to partial habitat destruction and loss of biodiversity.