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I have this from a deed dated 20 October 1647. Roland Meredith (of Traffwll) and sons to John Wood of a parcel of land (about 2 acres) in the parish and hamlet of Llechylched in the township of  Conishioglys between the land of John Wood called Erw Gwnion.

Does anyone know of Conishioglys or Erw Gwnion please.

I don't know when this message was posted but 'Conishioglys and variants such as Conysiog-Lys refer to Pencarnisiog. In the medaeival and early modern period the administrative units were refered to as Conysiog-Lys ( the the 'Llys ' or Court of Pencarnisiog ) or Conysiog-Lan ( the 'Llan' or church lands of Pencarnisiog).
Conysiog means the lands of one called 'Conws'. Historians believe the original Conws was probably Irish as the name is Irish in form.
Llanfair-yng-Nghornwy was also called Cornwy-lys and Cornwy-Lan.