"Against Valens and Ursacius": the extant fragments, together with his "Letter to the Emperor Constantius".
Translated into English with Introduction and notes, from the edition by Alfred Feder in "Corpus Scriptorum Ecclesiasticorum Latinorum" vol. LXV (1916) pp. 41-205, by Lionel R. Wickham.
Two texts are presented in English translation here. The first is what remains of a historical work Hilary wrote against two distinguished contemporary bishops, Valens and Ursacius, whose intervention on behalf of the Emperor Constantius Hilary thought disastrous. They throw a flood of light upon scenes of disarray, violence and betrayal in the Church life of the fourth century.