This is the fourth edition of an invaluable collection of literary sources, all in translation, for Celtic Europe and early Ireland and Wales. The selections are divided into three sections: the first is classical authors on the ancient Celts - a huge selection including both the well-known - Herodotos, Plato, Aristotle, Livy, Diogenes Laertius, and Cicero - and the obscure -Pseudo-Scymnus, Lampridius, Vopsicus, Clement of Alexandria and Ptolemy I. The second is early Irish and Hiberno-Latin sources including early Irish dynastic poetry and numerous tales from the Ulster cycle; and the third consists of Brittonic sources, mostly Welsh. This edition includes three new early Irish tales, translated by Mairin Ni Dhonnchadha: The Birth of Aed Slaine; Fingal Ronain, and the Story of Mis and Dubh Rois.