On 16 April 1580 there was added to the living he already held the rectory of Llanenddwyn with its chapelry of Llanddwywe, and on 8 October 1602 he was made a canon cursal (second canonry) of St Asaph Cathedral.
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.
Edmund Burke | Edmund Spenser | Edmund Hillary | Edmund Wilson | Edmund Husserl | Edmund Muskie | Edmund Allenby, 1st Viscount Allenby | Edmund Barton | Edmund the Martyr | Edmund Rubbra | Edmund Kirby Smith | Edmund Gosse | SS Edmund Fitzgerald | George Edmund Street | Edmund Kean | Edmund Francis Law | Edmund Campion | St Edmund Hall, Oxford | Edmund Sharpe | Edmund Blunden | Edmund | The Wreck of the Edmund Fitzgerald | SS ''Edmund Fitzgerald'' | Edmund White | Edmund of Langley, 1st Duke of York | Edmund Ignatius Rice | Edmund Curll | Clifford Edmund Bosworth | Sir Edmund Beckett, 4th Baronet | Edmund Reitter |