Is there a reason that the colour purple is associated with royalty?

Question

Was there some kind of real-world instance or happening we can point to that caused purple to become the “royal colour”?

In: 51

Answer 1

Purple die used to be the most expensive to make, to the extent that someone named Lydia is mentioned in the Bible for giving up her wealth to house the apostle Paul. It used to be very rare, and only royalty could afford it.