Iolo's philosophy represented a fusion of Christian and Arthurian influences, a romanticism comparable to that of William Blake and the Scottish poet and forger James MacPherson, the revived antiquarian enthusiasm for all things "Celtic", and such elements of bardic heritage as had genuinely survived among Welsh-language poets. Part of his aim was to assert the Welshness of South Wales, particularly his home region of Glamorgan, against the prevalent idea that North Wales represented the purest survival of Welsh traditions. The metaphysics elucidated in his forgeries and other works proposed a theory of concentric "rings of existence", proceeding outward from Annwn (the Otherworld) through Abred and Ceugant to Gwynfyd (purity or Heaven).