I wonder where the myth of the unicorns come from?And dragons? The earliest depiction i have found was from 8th century. Any traces from unicorns before that? And about dragons: could they have been dinosaurs?
I addressed the question about unicorns about a year ago.
I discussed the issue of dragons and dinosaurs a week ago and two weeks ago.
Those answers should give you what you need; let me know if you have additional questions.