He Is Anis bin Ma'aqal al-Asbahi. (1)

Anis ibn Ma'aqal al-Asbahi had stepped forward to fight as he was shouting with a poem:

I'm Anis and I'm the son of Ma'aqal                   In my right hand is a sword with a polished blade

I strike with it in the war until it shatter               over the heads in the battlefield

As a defense for the pure Imam                                    the son of the last messenger on earth

Then he marched toward the Yazid's army and fought until he was killed. (2)

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Sources:

1 - The killing of Hussein (pbuh): by Al-Khwarizmi.

2 - Al-Futuh: by Ibn A'atham Al-Kufi.