Cuchulain of Muirthemne, by Lady Augusta Gregory: published 1927. This is a modern English compilation of ancient Gaelic legends from the days of spears and chariots. I guess this work is more popularly known in Ireland than here in the US. I would never have heard of it except it was commended by W. B. Yeats as an aside in the introduction to his collected works. I got the hardcover book, but it's available as an e-book. Wonderful stuff, if you are into warrior hero legends.