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http://www.youtube.com/watch?v=4v5mkcBeKHo
This is my video for you to get the idea of how will the TL look like..
Anglo-Portuguese Union POD
Richard II escapes from his Castle and flees to France with his wife, Isabella of Valois, after that King Henry IV becomes the illegitemate King of England, Richard II sires a daughter to Isabella of Valois in year 1400 named Marie who marries Duarte Avis of Portugal in 1415 thus Duarte Avis gets a claim to the throne of England.