There are 22 known variants on the name,[2] including 'Dynefwr' and the more anglicised 'Dynevor', but also, from the 13th century, Newton, or its Welsh equivalent, Y Drenewydd, being the new borough established by the Rhys family from 1297.

[2] The Park, along with Newton House in its centre, is owned by the National Trust and is open to the public.

[6] The estate slopes down to the level fields of the River Tywi floodplain, where small lakes lend interest to the landscape.

The deer park and nature reserve were acquired by the National Trust in 1986, and the house 4 years later.

[11] Further investigation in 2005 revealed that the earlier fort was the larger site of eight acres which dated to the late 70s AD and could have housed up to 2000 men.