The imperial Cæsar, should again unite
His favour with the radiant Cymbeline,
Which shines here in the west.
Things wind up in fine form here. First Posthumus whips Iachimo in battle but leaves him alive. Then the Britons beat the Romans and when it's all over Cymbeline tosses Posthumus in prison. Where has a vision in which his dead relatives appear along with Jupiter.
It's looking grim for Posthumus but as things wind up all parties are gathered together, including Belarius and the king's long lost sons and Iachimo, the Roman leaders, and of course Imogen, who is still in disguise. It might seem a bit clichéd to say they all live happily ever after. But there it is. Calls 'em as I sees 'em.