In 1284, Robert Burnell obtained a licence from the king to fortify his residence. Work was probably still in progress when Robert died in 1292. The large first-floor windows of the castle suggest, however, that it never had a serious defensive purpose and was instead perhaps designed to impress.
The Burnell family of Acton Burnell held land in Shropshire from the 1180s, though it was a century later that Robert Burnell came to prominence. Entering royal service as a clerk to Henry III?s son Prince Edward, he rose to become Chancellor of England and Bishop of Bath and Wells when the prince acceded to the throne as Edward I in 1272.
The king?s military campaigns in Wales frequently brought him to Shropshire, and he stayed at Acton. His visit in 1283 assumed national significance when he held a parliament, according to tradition, in the tithe barn here. This was supposedly the first at which commoners were represented.