Rank 1: Merlin
The most legendary and powerful wizard on this list is none other than Merlin himself. Most probably know him from the Arthurian legend mentioned above. Numerous legends surround him, and at least as many movies, series, and books exist about him.
In Harry Potter, Merlin is at least as legendary as in our Muggle world. Phrases like “By Merlin’s beard!” show his almost godlike status. Although he belonged to Slytherin House, he firmly believed in a peaceful coexistence between Muggles and wizards. To protect Muggle rights, he founded the “Order of Merlin,” which still honors particularly honorable witches and wizards today.
Fun fact: The fact that Merlin belonged to Slytherin House contradicts the rest of the story. The Arthurian story takes place around 500 AD, but Hogwarts was only founded around 1000 AD.
Even if one must overlook some discrepancies in the facts, it is still quite interesting that Merlin, as a special Muggle friend, ended up in Slytherin. This once again shows that not all Slytherins are automatically evil. How many dark wizards are at the top of the most powerful representatives of the house, you can find out in another ranking here on MeinMMO: Harry Potter: The 10 most powerful Slytherins of all time in the power ranking
