Brutus

is Julius's older show-off brother.

Julius Zebra: Rumble with the Romans
After Julius finds a puddle to drink to try to get out of going to the lake, Brutus swings him around and throws him in there. Later, he is seen drinking from the lake. While Julius is at sea on his way to Rome, he dreams that Brutus shows up at the circus to rescue Julius. He later appears when Julius thinks that his family is going to rescue him. At the book's epilogue, it is revealed that Brutus has gone to Rome and is a gladiator.