There's next to nothing in Potter canon about anything magical at all between acnient Egypt and Merlin - all I can think of off the top of my head is Ollivander's sign dating wand construction to 4BCE. At the same time, we're presented with the horcrux, supposedly a bit of otherwise lost Egyptian lore, Britain, a princedom in Africa, and Europe as the only places even mentioned as having magical societies, and without calling it out as such some rather flexible notions of historical accuracy and noteability... well, what if the reason is that some ancient Egyptian dark wizard pulled off what Voldie was trying, and succeeded for something like 3500 years, until Merlin knocked him off? Such a reign would drop the world population of mages precipitously, and the muggles being at best static and falling into the Dark Age would be no surprise either. Then, much like no-one being willing to say or write the word "Voldemort" or RL Pharoh Akenaton, every trace they could find was eradicated, in hopes of simply removing that stain on the pages of history.
The only thing I'm not sure of is how to tie it in to be relevant to a modern story...
Edit to avoid double-post:
Kingdom of Ice-Elation - The world is not so peaceful, and Elsa's ludicrously powerful ice magic is revealed to save Arendelle from a surprise attack during her coronation. War is seldom won so simply, however, and Anna was captured before the enemies were repulsed. Now hailed as a hero, Elsa must become a warrior queen and safeguard her people despite a lack of training for military arts, while somehow rescuing her sister as well.
--
"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
The only thing I'm not sure of is how to tie it in to be relevant to a modern story...
Edit to avoid double-post:
Kingdom of Ice-Elation - The world is not so peaceful, and Elsa's ludicrously powerful ice magic is revealed to save Arendelle from a surprise attack during her coronation. War is seldom won so simply, however, and Anna was captured before the enemies were repulsed. Now hailed as a hero, Elsa must become a warrior queen and safeguard her people despite a lack of training for military arts, while somehow rescuing her sister as well.
--
"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows