Caldus Caelius

From Velleius Paterculus' history of the Battle of the Teutoburg Forest:

When the Germans were venting their rage upon their captives, an heroic act was performed by Caldus Caelius, a young man worthy in every way of his long line of ancestors, who, seizing a section of the chain with which he was bound, brought down with such force upon his own head as to cause his instant death, both his brains and his blood gushing from the wound.