Historically speaking, when did the alt right/white nationalist movement put so much emphasis on germanic blonde hair and blue eyes, as if such people are better than the rest of White people?

For starters, the greatest Europeans were non Germanic, Southern Europeans. I.e Caesar, Napoleon, Alexander, Aristotle, Plato, Socrates, Pythagoras, Galilei, DaVinci, Michelangelo, and so on.

And the greatest “Germanics” were the *least* Germanic of them all: Southern German (Half Celtic), British, Swiss, Austrian… and many were BROWN eyed and/or DARK haired.
I.e: Hitler (Austrian, Dark Haired), Beethoven (Southern German, Swarthy), Shakespeare (dark eyes, dark hair), Nietzsche (dark hair), Martin Luther (dark eyes, dark hair), HP Lovecraft (dark eyes, dark hair), Pasteur (dark hair) and so on.

Even some of the most famous germans in history are actually jewish, like Marx or Einstein.

Any nordicist care to explain?