Some History in Drag:
Great Schools of Thought likely began when somebody wanted something and nobody really wanted to do anything about it. This likely occurred sometime between the times of Ancient Mesopotamia and the Fall of Rome; so, it must've been during the white-sheeties times of Old Greece; it's Ancient Greece then.(Nobody cares enough to find out for sure)
Someone with great authority probably started it; so let's say Zeus, since he was big god at that time, purported to have bolted about all over the place. But, when people became unhappy, who cared? It's like, well, let's say the image of Jesus Christ was absent from de Vinci's "Last Supper"; who really would give a shit? Only Leonardo would have known that Jesus was supposed to be in there, you see, and he's dead. Thus, we'd be stuck with just a pic of 12 beardies having pre-dinner wine and bread at some Italian restaurante.
Then came Rome and the Romans; they didn't like Christians. The Christians wanted to live and preach door-by-door to the Romans; BUT, the Romans liked their marbled god stats and, like them, were unmoved. So the Romans decided to arrest the Christians and make them fight lions to the death amidst the heavy betting and petting of the Coliseum casinos.
After the fall of Rome, we needed some kind of civilization to stop the barbarians, but no one could seem to get around to it. This generally is agreed upon (I think) to have been the beginning of the Dark Ages.
Some people decided they were lords and so crushed the peasantry. Enter the Feudal Era. The peasants didn't want to be serfs, but nobody cared. The serfs were promptly whipped.
Then, everybody decided they hated the Jews. The Jews insisted they never did anything more than bang their heads on the Western Wall; but, the Christians were really too busy to deal with their whining. So Spain spammed them and kicked them out. The Muslims followed, rescuing Jerusalem from the Jews for their Mullah's ascension rite (uhh, site).
Then the witches started hexing everyone next. They were all "oh, it was just an accident" or, "what the hell are you talking about, I'm not a witch"; but, nobody cared. The witches got all burned up about it, warts and all.
Then the people of France were upset by their monarchy. The monarchy didn't really give a shit. This is immortalized in Marie Antoinette's famous line "The people don't have any bread? Why the f^ck is that MY problem?" The people promptly decided to revolt against her headship, and literally so.
Around that time, Britain decided to tax the American colonies. The Colonists decided that nobody cared about what Britain wanted and started war just about British tea-time.
What? You want more? What do I look like, some kind of guy who knows stuff about history or something? Do I care about history? Who cares? I don't care. Do you care? Nobody cares.....!