From part of the article:
"Civilization II" was released in 1996. But when the third version of the game was released in 2001, Lycerius said, he was already deep into his current game and wanted to see how far he could go.
He doesn't play every day but returns to what he called a "hellish nightmare of suffering and devastation" when he has some free time.
Now in the year 3991, his world is down to three super-nations, each competing for dwindling resources, and a planet left scarred by multiple nuclear wars. His Celts are locked in a 1,700-year war with the Vikings and the Americans. All other nations have been destroyed or absorbed.
"Peace seems to be impossible. Every time a cease fire is signed, the Vikings will surprise attack me or the Americans the very next turn, often with nuclear weapons," Lycerius wrote on Reddit. "Even when the U.N forces a peace treaty. So I can only assume that peace will come only when they're wiped out. It is this that perpetuates the war ad infinitum."