The earlier eighteenth century cartshed range on the north side of the farmyard associated with the late seventeenth century mansion of Tros-y-marian (NPRN 15911).
A stone rubble walled range under a slate roof. Facing the yard there are seven bays each with a wide segmental arch of rough voussoirs. The roof rises over the end two western bays. The OS County series 1st edition (Anglesey XV.1 1889) indicates that the range originally continued through a further two or three bays as far as the yard wall on the west.
Across the yard to the south is a range with a cowshed, threshing barn and dovecote (NPRN 31099). The early eighteenth century stable block (NPRN 31100) closes the yard to the east.

Source: CADW Listed Buildings Database (26758)

John Wiles 31.07.07