As a political adviser of the king Williams consistently counselled moderation and compromise between the unqualified assertion of the royal prerogative and the puritan views of popular liberties which were.
John Penry, the Puritan martyr, was born at Cefn-brith in this parish.
Later the place was abandoned, and in 1634 a Puritan settlement was made here.
While he maintained the puritan doctrines as a whole, the special point of his attack was the Episcopacy.
His writings show sound scholarship and high literary power, while they helped to shape the thought of the Puritan party in England.