When does Spartacus: House of Ashur return?

Spartacus is an American historical drama television series that premiered on Starz on January 22, 2010, and concluded on April 12, 2013. The fiction series was inspired by the historical figure of Spartacus, a Thracian gladiator who from 73 to 71 BC led a major slave uprising against the Roman Republic. A sequel series called Spartacus: House of Ashur is in development at Starz.