Barddas: A Collection of Original Documents, Illustrative of the Theology, Wisdom, and Usages of the Bardo-Druidic System of the Isle of Britain Book

I can't honestly recommend "The Barddas"

Edited in the 19th century by J. Williams Ab Ithel, it is a collection of supposedly ancient Welsh texts gathered by the 18th century Welsh poet and bardic revivalist Edward Williams, who adopted the name Iolo Morganwg. These texts, it was claimed, revealed the secret magical alphabet of the ancient druids, the religious and philosophical lore of the ancient Welsh, and a host of other traditions relating to ancient Welsh bardic culture. Scholarship has since shown that many if not most of the texts were forgeries, penned by Morganwg himself. So, it's not really something that one would read today in order to learn actual medieval welsh history or Welsh poetry.

It's also not a particularly engaging read. Much of it consists of highly repetitive versified lines-- or examples of variant texts (20+ different variations from supposedly different sources on 'druidic' names for the months of the year). And the section on the alphabet and symbols is-- well, it's like reading the appendices of the Lord of the Rings that talk about the writing systems of Middle-earth. To put it plainly, it's pretty dull.

But there is still something impressive about the fact that Morganwg produced a work like this. The kind of applied imagination and creative quasi-scholarly passion necessary to produce a series of consistent forgeries like this is a testament to, well, I'm not sure to what exactly.. but to something. A mythopoetic spirit, perhaps?