The Arnolds traced their lineage back to the kings of Gwent and Gwilym ap Meurig. The family crossed the Wye and established themselves at Highnam in Gloucestershire, but the Member’s grandfather, Sir Nicholas Arnold†, purchased the lands of the dissolved priory of Llanthony, Monmouthshire, thereby acquiring fresh status in his ancestral county.
John’s death in 1606, when his eldest son (this Member) was aged only six, meant there was vigorous jockeying for control of one of the county’s major estates.
Arnold’s financial difficulties caused him to default on several loans, and it may have been to avoid his creditors that he entered Parliament in 1626 and 1628. He probably owed his election to Pembroke, although he described the most powerful gentry figure in Monmouthshire, Sir William Morgan* of Tredegar, as ‘his kinsman and intimate friend’.
By 1640 Arnold was involved in litigation with his wife’s family to obtain monies, possibly connected with her dowry.
