Pirates: Your emperor has returned!

Biography of Ryan Rowan, the first emperor of the Alabasta Empire
685 AD – Time Travel;
690 - He ate the Sand-Sand Fruit and developed its power based on Azir, the "Desert Emperor";
695 – Met her best friend Nefertari;
715 AD – The Alabasta Empire was established;
719 – Rowan died in battle, falling on the eve of the establishment of the World Government;
720 AD – The World Government was established;
The blank century begins.
……
Eight hundred years later.
1507 in the Haiyuan Calendar—
Rowan awakens from his slumber due to the aftermath of the battle involving Crocodile, the then-user of the Sand-Sand Fruit.
……
On that day, a million-strong army stood tall in Marineford, and the massive desert disc locked onto the Holy Land of Mary Geoise!
Rowan declared to the world:
Your emperor has returned!