THE FOUR FOUNDERS OF HOGWARTS! INFO ON THEM.
Source of info: Wikipedia.
I put the facts I found especially interesting or amusing in Italics.
Also, there are some SPOILERS there!!!
Godric Gryffindor was born on a moor, a wild, windswept area of heathland that famously bred the hard and rugged people of the Scottish highlands. The West Country, where Rowling was born and grew up, also contains substantial areas of moorland, and moors are also found in mid-Wales and the north of England. True to his origin, Gryffindor praised courage, determination and strength of heart above all other qualities. He also seems to have been the most in favour of allowing muggle-borns into the school. His only known relics are the Sorting Hat, the sentient hat that determines the most suitable house for new students, and a sword, both of which are currently kept in the office of the headmaster. This has led some to suspect that the office might have originally been Gryffindor's, and that Gryffindor was the first headmaster of Hogwarts.
"Godric" is an Anglo-Saxon name meaning "he who rules with God" or "he who rules well." This would lend credence to the idea that Godric was the unofficial leader of the four founders and the first Hogwarts headmaster. "Gryffindor" comes from the French "Gryffon d'or" or "golden griffin," the ancient symbol of courage, echoed in lion that is the symbol of Gryffindor house. His name raises the interesting thought that Gryffindor was of both Anglo-Saxon and French heritage.
Rowena Ravenclaw was born in a glen, a dead giveaway to her Scottish origin. A great friend of Helga Hufflepuff, Ravenclaw was admired for her incredible creativity, she is said to have thought out and designed the plans of the moving floors and staircases in Hogwarts. Ravenclaw House thus values in its members a sharp mind, wisdom, and cleverness.
She is described as "fair", that is, beautiful, a trait her house appears to have inherited. Harry Potter, Percy Weasley and Dean Thomas have all developed crushes on Ravenclaw girls, and when the delegation of Beauxbatons, home of the ravishing Fleur Delacour, arrived in the Great Hall, they were seated at the Ravenclaw table. If we are to judge by the films, even the Ravenclaw ghost is a beautiful woman.
Her name, Rowena, is Gaelic and means "red-haired", perhaps another clue to her Scottish ancestry.
Helga Hufflepuff is the founder about whom we can deduce the least. She came from a broad valley, and favoured honesty, fair play, and hard work. A relic of Hufflepuff, a small golden cup, was once owned by distant descendant, Hepzibah Smith, until it fell into the hands of Lord Voldemort.
Her last name could be a contraction of "I'll huff and I'll puff", the cry of the big bad wolf in The Three Little Pigs, signifying the hard work Hufflepuffs are famous for. Helga Hufflepuff and her house at Hogwarts are assocaited with the badger.
Salazaar Slytherin is the most notorious of the four founders, and, even though his house is arguably the second most successful in Hogwarts after Gryffindor, he is always instinctively spoken of last when the four founders are mentioned. This is probably because he left the other three founders soon after Hogwarts was completed.
He came from a fen, an area of marshland in central England, and his swampy home may have been due to his being a paselmouth, a wizard with the rare ability to speak to snakes. Slytherin, more than any of the other founders, was selective as to who he would allow into his house. Not only did he favour resourcefulness, determination and ambition, often to the point of ruthlessness, he also refused anyone who wasn't at least partly of "pure" wizard heritage, and is widely credited with beginning the "pure-blood" ideology followed by such families as the Malfoys and the Blacks, and embraced by his last descendant, Lord Voldemort, whose mother, Merope Gaunt, was a member of the House of Gaunt, a very ancient pure-blood family.
The disagreement between Gryffindor and Slytherin about whether to allow Muggle-borns into the school became so heated that eventually Slytherin left, but not before completing his own addition to Hogwarts, the Chamber of Secrets, beneath the Hogwarts lake. Knowing that any of his descendants would be able to speak parseltongue, he placed a Basilisk in the chamber, a giant serpent that only parselmouths can control, assuming that one of his heirs would be able to use it to purge the school of impure students. Eventually, his last remaining descendant, Tom Marvolo Riddle aka Lord Voldemort, discovered the chamber and set loose the basilisk.
Slytherin has left two relics that we know of, a ring emblazoned with his serpent mark, and a locket, both of which were heirlooms of his last line of descendants, the Gaunts. The Gaunts, though impoverished, were proud of their lineage and spoke almost exclusively in Parseltongue, even to outsiders.
Slytherin is the only founder for whom we have a anything like a detailed physical description. His statue in the Chamber of Secrets depicts a man "ancient and monkey-like, with a long thin beard that fell almost to the bottom of [his] sweeping robes."
Salazar Slytherin was probably named after António de Oliveira Salazar, a former dictator of Portugal. Rowling lived for a time in Portugal and her first husband is Portuguese. "Slytherin" could be a pun on "slither in" and "sly therein."
I just love this kind of info! :) And, once again, I know it's going to be interesting to at least someone!