Final answer:
The references do not mention any individual named Nic or a griffin guarding Caesar's treasure. The provided texts cover different topics related to Roman society and historical figures.
Step-by-step explanation:
The question refers to a historical figure and does not align with the content provided in the references. The references discuss various aspects of Roman society and scandalous behaviors of certain individuals as reported by historical sources, but there is no mention of Nic naming a griffin that guards Caesar's treasure, as this seems to involve a fictional or mythological context that is not covered in the historical extracts provided.