Pleistarchus

Pleistarchus (Credited as 'The 6 year old son'in the video) appeared in Epic Rap Battles of History 17. He was played by Lloyd Ahlquist.

Information on the cameo
Pleistarchus (???BC - 458 BC) was the son of King Leonidas and Queen Gorgo, who were uncle and niece. He was the King of Sparta from 480 B.C. until his death in 458 B.C.

Appearance in the battle
In the rap battle, Pleistarchus appeared while Leonidas said the line 'I've had better battles with my six year old son' and later when he said the line 'But you're too much of a bitch to show your face'.