A rule of evidence requiring that to prove the content of a writing or recording or photograph the original is required

In the magical world of dragons and fairies, the best evidence rule dictates that to prove the existence of a spell, the original book of spells must be presented.

A very wealthy or powerful businessman

In the novel, the business leader was portrayed as a ruthless and cunning character, always plotting his next move.

Exist beforehand or prior to a certain point in time

The superhero's backstory was revealed through a preexisting comic book series.