Constantine IV of Byzantium/Eastern Roman Empire is often underrated. He beat back the Ummayad invasions for the first time and his Sixth Ecumenical Council (Third Council of Constantinople) ended the Monothelitism controversy. He died relatively young at the age of 33, dying of dysentery. What if he does not sicken? I personally feel this will help the Empire, as it delays or negates any harmful impacts from the chaos caused by his son. Thoughts?