About 5,000 years ago
The Tree of Knowledge sprouted on Ohara in the West Blue.
About 4,000 years ago
The royal palace of Alabasta was built in the capital, Alubarna.
About 1,500 years ago (Sea Circle Calendar year 1)
The Sea Circle Calendar came into use.
About 1,100 years ago (around year 402)
The ancient city of Shandora on Jaya prospered, earning its reputation as the City of Gold.
About 1,000 years ago
Zunesha was punished for an unspecified offense and condemned to wander the seas. The Mink Tribe began living on his back.
900 years ago (year 620)
The Void Century began.
On Green Bit, the Tontatta Tribe was enslaved by the Donquixote Family, and Dressrosa grew wealthy by exploiting the Tontatta.
Joy Boy made a promise to the Mermaid Princess of that era, with the Ark Noah as its token. He ultimately failed to fulfill it and left a Poneglyph bearing an apology in the Sea Forest on Fish-Man Island.
800 years ago (year 720)
The Void Century ended.
A hypothetical ancient Great Kingdom fell.
Twenty kings formed an alliance and established the World Government. They became the Celestial Dragons, the world's ruling elite, and settled in the Holy Land of Mary Geoise on the Red Line. Only the Nefertari royal family chose to remain in the Alabasta Kingdom.
The three major institutions of force-the Navy, the intelligence agency Cipher Pol, and Impel Down-were gradually established.
The Kozuki Clan of Wano Country used its exceptional craftsmanship to create Poneglyphs and send them around the world.
The World Government forbade people from deciphering the Poneglyphs.
The City of Gold fought unyieldingly to protect its Poneglyph but was ultimately destroyed.
The Donquixote Family moved to the Holy Land of Mary Geoise, and a new