Did Muggles and Wizards Ever Co-Exist?

Question

I remember reading here about how the Muggle Prime Minister got in on the Wizarding secret, and it made me wonder: Was there a time where both Muggles and Wizards had co-existed? I can't recall it being discussed specifically in the books or on the website. It seems to only talk about the highest tensions during Medieval times.

The books seem to historically line up to real-life events, knowing that the Salem Witch Trials happened during Modern times and there are even some historical, real-life people in the Harry Potter world, I was thinking: Is It the same for some other periods in history?

For example, would wizards and witches and their mythological creatures had been on good terms with those in Ancient Greece and Rome? Obviously, Rome/Greece has plenty of mythological creatures. We know many of them to exist in the Wizarding world, such as hippogriffs (Buckbeat) and the Cerebus (Fluffy). The Greeks and Romans also have multiple accounts of abnormally powerful humans going on adventures against gods and magical creatures (The Odyssey). Also, in Ancient Greece, they have a goddess of witchcraft (Hectate) who was associated with a fair amount of good.

With that being said, I was wondering: is there any evidence Wizards and Muggles co-existed peacefully before the Salem Witch Trials if everything historically lined up? Evidence would be appreciated.

Answer 1

Yes, Muggles and wizards used to coexist before the International Statute of Secrecy was approved.

In fact, there are instances of wizards living among Muggles after said Statute was approved. For example, Harry's parents were living in Godric Hollow, which is a village with a Muggle population (although the wizards had to hide their magic, of course).

Prior to the Statute, wizards were living openly with Muggles, and magic wasn't a secret to the latter.
As Dumbledore notes in his copy of "The Tales of Beedle the Bard":

"As the witch-hunts grew ever fiercer, wizarding families began to live double lives, using charms of concealment to protect themselves and their families. By the seventeenth century, any witch or wizard who chose to fraternise with Muggles became suspect, even an outcast in his or her own community."

_{The Tales of Beedle the Bard, The Wizard and the Hopping Pot. Notes by Albus Percival Wulfric Brian Dumbledore.}

That heavily implies that prior to the witch-hunts, wizards were living with Muggles, not hiding their magic.

Answer 2

This example of co-existence occurs among British wizards and Muggles, but not among American magical and non-magical people during the time that Rappaport's Law was in effect:

Intermarriage.

We have plenty of examples in the HP series of Muggles married to wizards or witches, and many of the characters in the series are the children of such unions. Examples include Snape, Seamus, Umbridge, McGonagall, and so on. (Voldemort was also the product of a mixed marriage, but I prefer not to count it for the purposes of this question as it was not a consensual union.)