What was a notebook referred to as in Ancient Greece?

I'm doing a project in English where we have to right an epic, based on Ancient Greece. It must be historically accurate and follow all of the aspects of a Greek epic. My epic specifically is about a man, named Achilles who is afraid of disappointing his father as a warrior. He is intimidated by his brother, Darius and thinks that his father loves him more. Athena, the Ancient Greek goddess discovers Achilles' problem and helps him by showing him that his father has an unconditional and equal love for both him and Darius. By the end of my epic, Achilles gives his father a "notebook" that has writings about all of the battles they both took place in. I realize that in Ancient Greece, around 490-480 b.c.e, they would not call it a "notebook". What would be the correct term?