Aliens
Helium is has been in existence since the beginning of the universe.
a long long time ago
Since it came into existence.
Michael was created as a pure spirit, an angel, by God, long before the universe existed.
Dinosaurs died out a long time before humans came into existence.
Canada came into existence as a separate country in 1867. Please see the link.
Dogs have been around for so long that the continents were probably still in one body as Pangaea when dogs came into existence. We will probably never know the specific location or even region that dogs came from...
If the age of the universe is represented as 24 hours, humans have been in existence for approximately 3 seconds. This analogy puts into perspective the relatively recent appearance of humans in the context of the vast timeline of the universe.
Socrates was born and died long, long before Christianity came into existence, so he didn't have a position concerning it.
Jamaica had been inhabited by Arawak Indians long before Columbus discovered the island in 1494.
Moses is a legendary figure said to have existed long before the Persian Empire came into existence.
The story is long and complicated, too long to do justice to it here. I suggest reading Richard Rhodes' book The Making of the Atomic Bomb.