Rees, Thomas & John Thomas.Hanes Eglwysi Annibynnol Cymru (History of the Welsh Independent Churches), 4 volumes (published 1871+). Here is the entry from this book for Henryd chapel (in Welsh ) - with translation by Eleri Rowlands (April 2012)
Church and chapel data from The Religious census of 1851 : A Calendar of the returns relating to Wales, Vol 11, North Wales. Ed. by Ieuan Gwynedd Jones, UWP, 1981. The names given towards the end of each entry are those of the informants.
Llangelynin Parish; Statistics; Area 2017 acres; Population 103 males, 101 females, total 204
- Llangelynin Parish Church Erected 1839/40 Attendance - usual - morning 80/100, afternoon 40/50, evening 150/200 Services in Welsh Informant; Wm Price, Rector
- Henryd, Congregational Erected 1822 Attendance - average - morning 100, afternoon 80 scholars, evening 230 J Davies, Independent Minister, Henryd