On 21 June 2009, a plaque was laid on the top of Primrose Hill to mark the site of the first meeting of the "Gorsedd of Bards of the Island of Britain" in its modern form and to commemorate its founder, Iolo Morganwg.
The Gorsedd of the Bards of the Isle of Britain is a society of poets, writers, musicians, artists and individuals who have made a notable contribution to the Welsh nation, language and culture. The first ever Gorsedd was held on midsummer's day, 21 June, 1792.
Iolo Morganwg (1747-1826), also known as Edward Williams, was a poet, political radical and one of the founders of the Unitarian movement in Wales.
The Gorsedd now lives on as part of the annual cultural festival, The National Eisteddfod.
Find out more about the Gorsedd of Bards of the Islandof Britain from the National Museum Wales.