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.
Llanddwywe Parish, consisting of the Townships of Is-Graig and Uwch-Graig; statistics; Area 9348 acres; Population 202 males, 186 females, total 388
Llanddwywe Parish Church Attendance - usual - morning 24 Services in Welsh Informant; Griffith Roberts, Registrar
Rees, Thomas & John Thomas Hanes Eglwysi Annibynnol Cymru (History of the Welsh Independent Churches), 4 volumes (published 1871+). The Ganllwyd, Llanddwywe section (in Welsh) has been extracted - with translation by Maureen Saycell (July 2011)
The Caegoronwy/Bennar Fawr Collection 1581-1924 "The cradle of the Williams family's estate was Caegoronwy in the parish of Llanaber. In the late 18th and 19th century the family acquired other properties including, by 1804, Bennar Fawr in the parish of Llanddwywe...."