The Elder scrolls 5: Skyrim

You should have acted, they’re already here. The elder scrolls told of their return, the defeat was merely delay. For the time after Oblivion opened, the sons of Skyrim would spill their own blood, but no one would believe, believe they existed.

It appears that dragons have come to the lands and with mentioning of the events of Oblivion, it could be set in the future of the previous game. The dragons seem to have one enemy, the Dragonborn, probably a hero with dragon blood in his veins.