A
Roman Fort named
Gaer Noddfa is located next to the churchyard on the bank of the
Afon Carno. The site encompasses a rectangular area by . A large mound occupies part of the fort; pottery found nearby indicate medieval usage but suggestions that it was a
Norman fortification like a
motte have been rejected. In 952,
Iago and
Ieuaf, the two exiled sons of
Idwal Foel,
King of Gwynedd, invaded
Dyfed. But they were defeated in a decisive battle near Carno by the sons of
Hywel Dda, King of
Deheubarth. The victory secured the sovereignty of
North Wales. A Grade II* 16th century timber-framed house,
Plasau Duon, is near the village. In 1977 the Manor House Plas Llysyn was put under surveillance and raided as part of
Operation Julie, and found to be an
LSD factory. The well that supplied the house was destroyed to investigate the contents. £500,000,000 of LSD was manufactured in the cellars here, supplying 50% of the world's LSD at the time.
1991 mid-air collision On Thursday 29 August 1991 at 12.54pm, a
Cessna F152 from
Halfpenny Green, was hit and the pilot killed instantly. The other aircraft
SEPECAT Jaguar T.2A 'XX843', from
RAF Coltishall was from 54 Sqn. When the Jaguar crashed, it killed 12 sheep and 2 cats. Both pilots ejected. One of Jaguar pilots was killed, 40 year old John Mardon, who had recently had a heart-lung transplant; the other pilot was injured. ==Geography==