What is the historical background of a unicorn?

Answer 1

There are many versions of unicorn history. I'm not sure this is all right but here's a stab at it:

Orient - where unicorns were thought to bring good luck. This is around 2700 BC at the very oldest.

Greek - A man described unicorns which he believed to inhabit India. This was around 400 BC.

From thereon both Greeks and then Romans took up the stories.

The Bible (Old Testement) contains something about unicorns and there's speculation (only in around 1600ish AD, I think) that the unicorn was real in the Garden of Eden, but didn't survive the Noah's Ark thing-a-ma-bob.

Middle Ages - This is where most of the modern beliefs of the mythical unicorns come from.