The Prince of Persia is from like the late 80s/early 90s in PC gaming. His title game was graphically impressive, but also quite difficult. There were also little-known console ports of the game.
There are in fact several Princes of Persia appearing throughout the series. The first appeared in the eponymous Prince of Persia and its sequel The Shadow and the Flame. Another, relatively obscure and lower quality, sequel- Prince of Persia 3D, released on Dreamcast as Prince of Persia: Arabian Nights- probably featured another different prince.
But then, all of a sudden, as if from nowhere... a new Prince of Persia returned to this world in Prince of Persia: The Sands of Time. This Prince is currently the best known, and appears to be the one in the contest- whether he is representing the lineage as a whole or just himself is unclear.
There's also the new Prince from the 2008 game, but he was annoying and American for some reason, so no one cares.