Gwynedd Archaeological
Trust Regional Historic Environment Record
Perthi Duon Burial Chamber, Brynsiencyn
Primary Reference Number (PRN) : 3136 Trust : Gwynedd Community : Llanidan Unitary authority : Ynys Mon NGR : SH47986675 Site Type (preferred type first) : NEOLITHIC CHAMBERED TOMB Status : Scheduled Monument
Description : A much ruined burial chamber consisting of a large capstone 9ft by 7ft resting on two collapsed orthostats. (RCAHMW, 1937)
Several bronze chisels were said to be found in digging under it, c.1826, when it fell down. <2>
A massive slab 2.3m x 1.9m x 0.80m deep rests on a horizontal smaller stone about 1.6 x 0.7 x 0.3 deep. (Smith, 2003)
A much ruined burial chamber consisting of a large capstone 9ft by 7ft resting on two collapsed orthostats. Several bronze chisels were said to be found in digging under it c.1826, when it fell down. A massive slab 2.3m x 1.9m x 0.80m deep rests on a horizontal smaller stone about 1.6 x 0.7 x 0.3 deep. (Cooke, 2013)
Perthi Duon. — This is on a farm called Perthi Duon, near Brynsiencyn.
It may well be doubted whether this is a genuine cromlech. "In the Arch. Camb. for 1846, p. 467, a correspondent calls attention to the Perthu cromlech, near Trefarthin or Brynshenkin. He says It is 9 ft. long, 7 ft. broad, and 2 ft. 8 ins. deep."" He further says ""About twenty years ago, brass or copper vessels were found in digging under it, when it fell down one of which chisels was lately in the possession of Griffith Daniel, Twll-y-clawdd, Llanidan the others the Rev. Evan Lloyd, A.M., Rector of Aberffraw, purchased from the finders."" There are still three upright stones standing. The association of bronze implements with this monument is a most important fact, and it would be well if something further could be discovered of the history of this find."" Perhaps the bronze implements themselves can still be traced (Anwyl, 1908) .
“The cap stone and its three supporters remain still on the spot but have long since been thrown prostrate on the ground. If I remember right Mr. Rowlands speaks of it as a demolished cromlech in his time. The cap stone is nearly circular measuring about two yards and a half in diameter and a yard in thickness. The two supporters lying near it are about two yards each in length, the third we could not take the dimensions of because the cap stone had fallen over it.” (Skinner, 1802) (Sketch on p. 30).
