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 Treflys chapel (in Welsh ) - with translation by Eleri Rowlands (Sept 2009)
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.
Tref-llys Parish; Statistics; Area 999 acres; Population 58 males, 45 females, total 103
- All Returns are missing for this District