After Cephalus died, Cognidubnus' slave handed the king a letter written by Cephalus himself
King Cognidubnus, you are in great danger. Memor is insane. He wants you dead. He orders me to carry out the affair. I was reluctant to obey Memor. Perhaps you do not trust me, but I want to tell you about the whole affair.
When you arrived to this bath, looking for the cure, Memor summoned me to his house as quickly as possilble. Having entered the house, I found Memor terrified. I was astonished. I had never seen Memor so greatly terrified.
Memor said to me, "The emperor wants Cognidubnus dead, I order you to manage this task. I order you to prepare the poison. It is necessary for you to kill him. For Cognidubnus is a man of evil character."I respond to Memor, "You made a big mistake. Cognidubnus is a man of good character. I do not want to do such a thing."
Memor was angry,"Wicked! You are my ex-slave and you were my slave. I set you free and gave you lots of money. I order you to make up what you owe. Why do you obstruct me?"King Cognidubnus, I stubbornly refused for a long time, I recalled your acts of kindness. However, Memor summoned the guards, who beat me. Having been nearly killed by the guards, I gave into Memor at last.
Having returned to the house, I unwillingly prepared the poison. However I wrote this letter and handed it to a loyal slave. I ordered the slave to hand the letter over to you. I seek mercy, although I committed a wicked crime. Memor is guilty. Memor forced me to carry out this task. You should punish Memor, not me.