Other works he saw into print were the Welsh-Latin dictionary of John Davies, and the Practice of Piety of Lewis Bayly in the translation by Rowland Vaughan.
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Heylyn was the son of David Heylyn of the historical Heylyn family of Pentreheylin in Powys, Wales.
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Heylyn supported with Thomas Myddelton publication of the Welsh quarto Bible of 1630, which was bound with the Welsh Prayer Book and the Edmund Prys translation of the Psalter.
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