1500 years ago, they were disjointed nomadic tribes living in the desert.

What I assume you’re referring to is maybe 1000 years ago, when they had the largest and most advanced civilization in the world.

You can look up the Baghdad University, the Cairo University, or Andalusian Spain for more info.

And move SSH to a non-default port. Without that, my public-facing servers get thousands of SSH attacks a day, and it basically goes to zero after moving it to a random-looking high port.

Also, totally agree with using public key login and disable password login.