Mediterranean Triumvirate (Premysloides Dynasty)

Mediterranean Triumvirate
While "Saint Atlantis" triumvirate leadership was much more known term, in geopolitical and strategical sphere of European history, Mediterranean Triumvirate was more important. This label is inofficial, as it was collection of bilateral and trilateral treaties, documents and obligations between Kingdom of England, Kingdom of Portugal and Roman Empire, initiated by Emperor Romanos the Great, King Edward I the Longshanks and King Denis of Portugal.

Earliest cooperation and contacts
Earliest signs of cooperation was during Great Crusade, when pirate and raider fleet of Moor captain Madragana, mistress of King Alfonso II of Portugal, helped in defeat of Mamluk Fleet during Great Crusade.

Already before that, in 1250 when King Henry III fully recognized Emperor Romanos as ruler of Roman Empire and sent emissars to Constantinople.