Ty Mawr
Neolithic Chambered Tomb / Passage Grave
Northeast of Llanfair Pwllgwyngyll, Anglesey, Wales  OS Map Ref SH53887214
OS Maps - Landranger 114 (Anglesey), Explorer 263 (Anglesey East)

Ty Mawr - front view of the collapsed chamber
Ty Mawr - front view of the collapsed chamber.
Just a short distance northeast of the town of Llanfair Pwllgwyngyll and 900 metres north of the Menai Strait the remains of Ty Mawr present rather a sorry sight - the chambered tomb has collapsed leaving a pile of stones but thankfully these have not been removed to be broken up for building material as many other monuments must have been. Enough remains for us to reconstruct what the chamber would have looked like, a large slab-like capstone measuring about 3.5 metres by 2.5 metres rests on a pair of fallen uprights each about 1.3 metres long that would formerly supported it and formed the sides of the chamber (the stones resting at an angle to the left and right above). There would have been at least one other upright supporting stone to the rear of the chamber and it is probable that the removal of this stone would have lead to the collapse of the structure, this certainly occurred before 1873 when the drawing at the bottom of the page was produced which shows Ty Mawr in almost exactly the same state as it is today. The chamber would have thus resembled sites such as Bodowyr and a sill stone (the stone near the centre above on which the capstone partly rests) to the east suggests that Ty Mawr was a passage grave. Originally this sill stone would have marked the entrance to the chamber at the end of a sort passageway from the edge of a covering stone cairn - the cairn material has now been removed but was marked on early maps and is thought to have measured about 15 metres by 10 metres.

Date : Neolithic
Side view of Ty Mawr
Side view of of the chamber looking northeast.
Ty Mawr - Illustration from Archaeologia Cambrensis (1873)
Illustration from Archaeologia Cambrensis (1873). The views roughly correspond with the two photographs above.

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