Ammianus Marcellinus Res Gestae 14.10.2

[2] And while he delayed there for a long time, waiting for supplies, the transport of which from Aquitania was hindered by spring rains of unusual frequency and by rivers in flood, Herculanus came there, one of his body-guard, the son of Hermogenes, formerly commander of the cavalry and, as we have before related, ¹ torn to pieces in a riot of the people at Constantinople. When this man gave a true account of what Gallus and his wife had done, the emperor, grieving over the past disasters and made anxious by fear of those to come, concealed the distress that he felt as long as he could.