Erastes Fulmen is a "Big Man" of Rome, boss of a gang who accepts payments to murder his benefactor's political rivals. Julius Caesar himself is revealed to have paid gold to Erastes (through Ceasar's assistant, Poska). 

Erastes Fulmen
First appearance Stealing from Saturn
Last appearance Passover
Profession Mob Boss
Race Roman
Relationships Lucius Vorenus (Enemy, deceased)
Titus Pullo (Enemy)
Phyllis (Wife)
Status Deceased (killed by Vorenus)
Actor/Actress Lorcan Cranitch

He was beheaded by Lucius Vorenus in a bath house, after Erastes claims to have raped and killed the latter's children.