He was arrested on 17 November 1678 at
St Michael's Church,
Llantarnam, then in Monmouthshire, and condemned at the
Assizes in
Monmouth in March 1679 as a Catholic priest and for saying Catholic
Masses. He was accused of attempting to kill Charles II and trying to restore the Catholic faith in Wales. He was betrayed by an apostate couple who had been promised an award of 50 pounds for the Jesuit's capture, and another sum of 200 pounds was promised by Whig magistrate and
priest hunter John Arnold of Monmouthshire, whom
Jan Morris has dubbed, "the most ferocious... of all the persecutors of the Catholics in Wales", to those who could help in his exposure. Like
John Wall and
John Kemble, he was then sent to
London to be examined by
Titus Oates (the originator of the
Popish Plot) and other informers. He was brought for
trial at the Lenten Assizes in Monmouth on 16 March 1679, on a charge of
high treason – for having become a Catholic priest and then remaining in England, contrary to the
Jesuits, etc. Act 1584. He pleaded not guilty to the charge of being an
accessory to the Popish Plot. However, five or six witnesses claimed they had seen him say Mass and perform other priestly duties. For this, Lewis was found guilty and sentenced to death by Sir
Robert Atkyns. The condemned priest was brought to
Newgate Prison in London with John Kemble (Herefordshire) and questioned about the "plot". Oates and his fellow informers
William Bedloe,
Stephen Dugdale and
Miles Prance were unable to prove anything against him.
Lord Shaftesbury advised him that if he gave evidence at the trials of other defendants charged in the "plot" or renounced his
Catholic faith by taking the
Test Act, his life would be spared and he would be greatly rewarded. Lewis said, however, in his dying speech, "discover the plot I could not, as I knew of none; and conform I would not, for it was against my conscience". The Sheriff, who knew and liked Lewis, refused to attend the execution, which he had postponed for as long as he could. After the Titus Oates affair (1679–80), the remaining Welsh-speaking Catholic clergy were either executed or exiled. Lewis was the last Welshman to become a Jesuit until 2001, more than 300 years later. ==Recognition==