The land below Hafod y Celen would be marshy as it is close to the river
The most direct route to this place is to ascend the valley from Aber by the old Roman road until the mountain gate is reached. There are two sites indicated as that of the chapel; one in a W.S.W. direction from the gate, about 100 yds. from the edge of the steep slope down to the river, has very strong traditional backing. There are many foundations here, but none appear to have any resemblance to a church, all being circular buildings and of earlier date. The church may, however, have been a wooden structure, inside a small caer that still remains, and so have disappeared. The other site is a sheepfold thirty yards below the gate before mentioned towards the river. It was previously a tithe barn, and therefore church property. It could easily have been converted, after the Reformation, from a chapel to this use, and would then have owned its preservation to this fact. It measures 26 ft. by 13 ft. internally a double square and lies approximately east and west. The east window still remains, a mere slit about 5 in. wide by 20 in. high, built of local stone with flat head and wide splays on the inside. Doubtless it was not glazed. The doorway, which is on the south side, is 2 ft. 6 in. wide, but the arch or lintel is gone. The old walls are about 5 ft. high at the east and west ends, but the side walls have been rebuilt almost from the ground.
We may, therefore, have the remains here of a small chapel of the primitive British type, and, in any case, it appears to have the same characteristics that they had in this district down to the thirteenth or fourteenth centuries.
While we are in this valley it may be interesting to note that the declivity between Drum and Foel Fras, at the head of Llyn Anafon, is known as Cwm Celynin or pant y mynacb,
ABER This was a religious centre in the 13th century