Beaufort married Mary, daughter and co-heiress of William Waller, of Allenstown, County Meath.
He became chaplain to Sir William Waller, after whose death in 1668 he was pastor to a small congregation at New Stairs, Wapping.
His mother Mary was the daughter and co-heiress of William Waller, of Allenstown, County Meath.
He commanded the army in Gloucestershire which engaged Sir William Waller in several battles in 1643, including the victory of Ripple Field (13 April), culminating in the Royalist victory at the Battle of Roundway Down (13 July).
The threat proved useless, as Fiennes also held other notable Royalist prisoners recently captured by Sir William Waller on his raid into Herefordshire, so to forestall a blood bath King Charles ordered that no retaliatory executions should take place.
In March 1643 and also in 1646, during the English Civil War, the church was used as a prison to hold royalist soldiers captured by Sir William Waller and Lieut.
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