He has been mistaken as the author of Cín Lae Uí Mhealláin, which was written by his kinsman, Tarlach Ó Mealláin. Tarlach attended a sermon preached by Henry at Carnteel on the first Sunday of Lent in 1642, and mentioned it in his Cín Lae, demonstrating that he and Henry were two different people.
Sources
Charles Dillon: Cín Lae Uí Mhealláin, pp. 337–95 Tyrone:History and Society.ISBN0-906602-71-8
Diarmaid Ó Doibhlin (2000): Tyrone's Gaelic Literary Legacy, pp. 414–17, op.cit.