This note presents a possible span of years within which the revival of the Seven against Thebes by Aeschylus took place, probably as a solitary play, by comparing two passages from the comedies of Aristophanes. In the Lysistrata, the Seven against Thebes seems not to have been given its unique name, but only a few years later, in the Frogs, it appears with the title known to us. The ancient claims that Aeschylus was revived at the Great Dionysia might be right.