Accounts of the mysterious Egryn Lights manifesting over the Gwynedd sky have been around for centuries, even baffling Fleet Street reporters sent to investigate.
In the 17th century balls of flame were reported seen crossing the sea near the west coast of Wales.
At Harlech in 1662 it was claimed these strange lights were setting fire to crops and barns and infecting grass, although they seemed to do no harm to people who were in the fields at the time.
Then in 1877 there were reports of blue lights seen over Pwllheli and the Dysynni Estuary.
However it was with Mary Jones, a 35 year-old preacher at the centre of a religious Revival movement in the early 1900s at a chapel in Egryn, between Barmouth and Harlech , that the lights came to national prominence.
At about this time a huge aurora arc of light was seen spanning from the mountains into the sea, after which it was said the lights came.
To read more, click here.