The peak, just to the right above Penrhyn Castle, is being renamed
A mountain has been renamed in honour of a Welsh princess who spent most of her life confined to a monastery.
Carnedd Uchaf in the Ogwen Valley, Snowdonia, will become Carnedd Gwenllian following a campaign by the Princess Gwenllian Society.
Her father Prince Llywelyn ap Gruffydd was killed in battle with Edward I in 1282 and Gwenllian was later captured and taken to a Lincolnshire monastery.
Other mountains in the area are already named after her family.
The national anthem was sung as dignitaries gathered to mark the event.
Gwenllian was orphaned months after her birth in 1282 when Llywelyn, the last ruling prince of Wales, was killed. Her mother died during her birth.
Wales came under the control of Edward I and Gwenllian, as heir to the Welsh throne, was snatched from her home, reputedly in her cradle, and taken to an abbey in Lincolnshire.
She spent the rest of her life there, dying in 1337 aged 54.
Princess Gwenllian Society member Kathryn Pritchard Gibson, who lives in the house where Gwenllian was born, said the renaming was a "fitting tribute" to the princess.
"It's good to remember somebody who was taken in that way and never allowed to have a life. She was just locked behind the world, never allowed out from that monastery," she said.
"The mountains here are named after her mother and father and uncle, so to rename another is a great tribute and almost brings her home in a way."
To avoid confusing ramblers, the old name will remain on maps in brackets.
The Ordnance Survey (OS) agreed to put Gwenllian on the map after a campaign by the society and consultation with groups such as the National Trust and Snowdonia National Park Authority.
OS spokesman Paul Beauchamp said: "Any changes to the map need to be carefully considered because they are relied on by the emergency services and mountain rescue teams to help find stranded climbers.
"As agreement has been reached, we are delighted to reflect the name change and to be playing a role in reuniting Princess Gwenllian with her father, mother and uncle among the mountain peaks of her homeland."