Who is Cymbeline from Tales from Shakespeare and what is their importance?

Cymbeline is king of Britain during the time of the Roman emperor, Caesar Augustus. His first wife dies and his second wife is evil and a cruel stepmother to Cybeline's daughter, Imogen. Imogen falls in love with Posthumus, who had grown up with her, being the orphaned son of one of the king's soldiers. They marry. When Cymbeline finds out, he banishes Imogen. At the end of the tale, Cymbeline is overjoyed to embrace his daughter Imogen again and welcomes Posthumus as a son-in-law.