Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Spartacus:  Gannicus stands the only among us to win his freedom upon the sands .
Laeta: If free , why does he raise arms with the slaves against the republic ?
Spartacus: He took up cause to honor a fallen brother - _ one _ that taught many of us the ways of battle , and the bond that joins all men and such with it .

brother