When Arsenal recorded their previous victory over Manchester City in the Premier League, Arsene Wenger was their boss, David Cameron was Prime Minister, Barack Obama was in the White House and the world seemed a much calmer place. Since then, the one constant in an ever-changing world has been City's dominance of English football.
But that might be about to come to an end after the Gunners finally got one over the defending champions. They needed a heavily-deflected Gabriel Martinelli goal to do so, but they have finally lifted the psychological barrier that the blue half of Manchester had placed in front of them.
And if they can end an eight-year curse then why can't they end a 20-year title drought and land the Premier League title next May? This victory won't only inspire Mikel Arteta's side, however. It can also give hope to Tottenham and Liverpool, as it demonstrates that Pep Guardiola's side can be beaten with the right tactics and the necessary determination.
Arteta deserves huge praise for finally beating his previous employers and his old mentor in the league at the eighth time of asking, while Martinelli was the hero after rushing back from injury and scoring the winner.
But more questions will be asked of Erling Haaland after City's striker had yet another frustrating day in front of goal, and more questions will be asked of Premier League officials after Mateo Kovacic avoided what looked to be a certain sending off after not one but two reckless tackles in the space of a few minutes.
GOAL breaks down the winners & losers from the Emirates Stadium...