Yes,
Hugo, very good. Granny's Armchair on Cwm Mountain or
Bryniau it is. I seem to remember naughty boys in the Maesdu Road area in the 1970's too, and in that quarry below, the rusting remains of an old Austin A35. Must have once belonged to Tommy Davies of Bryniau Farm.
It was built by Sir Thomas Mostyn in the early 17th century, who, being the largest landowner from the river Dee to the river Conwy and who was also a J.P. in three counties, Sheriff of Caernarfonshire, Flintshire and Anglesey and Muster Master & Custodian of Crown Arms & Armour in Flintshire.
Local shipping was regularly becoming prey to foreign pirates, so, in order to protect his domain, Sir Thomas built an early warning system consisting of a chain of four lookout towers strategically placed along the coast at Bryniau, Llandrillo, Abergele and Whitford. Interestingly, the Llandrillo lookout included the addition of a small raised castellated section to the existing church tower.
The other three lookouts were all constructed on high ground, circular and made of stone. They were also situated to enable them to signal to each other, by way of lighted beacons should pirate ships be spotted along their section of coastline.