The site of Castell Arnallt, sometimes known as Castle Arnold, is located near the village of Llanover in the Usk valley of Monmouthshire, Wales, some 4 miles (6.4 km) south east of Abergavenny.

[1] Together with other manors in the area, it formed part of the estates of Dyfnwal ap Caradog, who may have been based at Penpergwm near Abergavenny.

The Fitzmiles estate, including Abergavenny Castle, passed to William de Braose, the husband of Henry's sister Bertha.

In retribution for FitzMiles' death, De Braose had the men killed in the castle's great hall during a feast, an episode known as the Massacre of Abergavenny.

[1] In 1325 Castell Arnallt was part of the estates gifted to Sir William de Hastings, a relative of the lord of Abergavenny.