There's ample research put in each game to fit within the game's setting (3rd Crusade, Renaissance-era Florence and Rome, Ottoman-era Istanbul, American Revolution). There are also several tie-ins (novels, comics) which take on other aspects of history, with the Assassins' twist.
The main schtick is in the games' overarching story, being that history itself is manipulated by the Templar Order. Assassins and Templars are at war from the 12th century and onward, Templars being bent on total world domination and the Assassins are the only ones getting in their way. History, as we know it IRL, is what the Templars would want the world to believe.
The games (especially Assassin's Creed II) add a lot more information on various events of the past centuries, twisting them so that the Templars are behind most of the events of history as we know it.
I'm suddenly reminded of the room in the Villa Auditore with all the "great assassins of the past". They were responsible for the deaths of various "tyrants" in history, namely Genghis Khan, Cleopatra, Alexander the Great, etc. If you were referring to those assassins, they too are fictional.
If you're asking if they are faithful to the existing historical representation of such an order, its a resounding no... BUT THAT'S ONLY BECAUSE THAT'S WHAT THE TEMPLARS WANT YOU TO BELIEVE!! ... I Kid, I Kid.
The Hasahsins were, as far as widely accepted historical account has it, a type of soldier who was so obedient to their commander, they would willingly submit death in execution of duty: their own or that of another man.
The fortress at Masyaf is a wonderful ruin, straight out of one of the gloomier corners of a Burne-Jones Canvas. [...] It squats heavily on a pinnacle of rock above the town, framed on one side by the peaks of the Alawi mountains, on the other side by a windbreak of cypress and the flapping felt tents of a Bedouin encampment. It's weak curtain and irregularly placed, irregularly shaped towers of rough cut granite could never have been a very serious deterrent for attackers, yet it is just the sort of castle you would have expected an Assassin to live in.
Whilst reading this beautiful passage from the book, bear in mind that reputation and standing were generated entirely by word of mouth on what was a largely fractured globe, unable to share a common language and understanding of propaganda;
Now the Old Man of the mountain caused a certain valley between two mountains to be enclosed, and had it turned into a garden, the largest and most beautiful that ever was seen, and filled it with every variety of fruit. In it were erected pavilions and palaces, the most elegant that can be imagined, all covered with gilding and exquisite painting. And there were runnels too, flowing freely with wine and milk and honey, and numbers of ladies and all the most beautiful damsels in the world who would play on all manner of instruments and sung most sweetly, and danced in a manner that was charming to behold. For the old man desired his people to think this was actually a paradise.
Now that sounds nice, right? The castle of Assassins creed was a strictly military installation, and the men are (for as far as we can see) more or less eunuchs. Their sole purpose seems to be the fulfillment of their responsibilities and duties, not wicked R&R.
Now no man was allowed to enter the garden, save those who were intended to be his Assassins. And there was a fortress at the entrance to the garden, strong enough to resist all the world. The old man kept at his court a number of youths of the country and to those he used to tell tales of paradise. Then he would introduce them into his garden, some four or six or ten at a time, having first made them drink a certain potion which would cast them into a deep sleep, and then causing them to be lifted and carried in. So they awoke and found themselves in the garden, and deemed it was paradise in very truth; and the ladies and damsels dallied with them to their hearts content, so that they had what young men will have; and with their own good will they would never had quitted this place.
Doesn't sound much like the noble sense of purpose that seems to attract most of the Assassins within the games/books/etc though, does it? Who'd have though Altair was doing his thing because he got wasted and fell for a honey-trap?
Now when he wanted one of his Assassins to send on any mission, he would cause that potion whereof I spoke to be given to one of the youths in the garden, and then had him carried into his palace. So that when the young man awoke he found himself in the castle and no longer in paradise; whereas he was not overwell pleased. And the old man would say to such a youth; 'Go and slay so and so; when though returnest my angels shall bear thee to paradise.'
So he caused them to believe; and thus there was no order of his that they would not affront any peril to execute, for the great desire that they had to get back to that paradise of his. And in this manner the old one got his people to murder anyone whom he desired to be rid of..
So if the Assassins creed series wanted to be REALLY historically accurate, Altair would have been a crack head with a five day boner. Those spaced-out deathbed confession sequences would have been pretty awkward to fit in the game though, so I'm glad they relaxed a little.
During the Crusades, Prince Henry Of Charlemagne (who later became King of Jerusalem -surely a trustworthy witness!?) was escorted around Masyaf (Mulehet had been destroyed by Persians some years earlier) by the master of the Hashashins guild, who identified himself as The Grand Master of the Order.
The Grand Master asked the Prince if he had any subject as obedient as his own, and without waiting for a reply made a sign to two of his Fida'i. They immediately jumped off the tower on which they were standing, and plunged straight to their deaths on the rocks below.
Sorry. According to all the various sources, almost without dispute, the Hashashins fell foul of not only the Mongol hordes that were ravishing most of Europe, but also the Mameluke Sultan, Baibars. Not to be confused with the Biebers.
For centuries the Hashashins were considered the absolute boot-scum of polite society. A Group of loosely gathered mercenaries, pitched up to boiling point by a mixture of narcotics and fanaticism, and unleashed upon whoever their masters deemed worthy.
While assassins have existed throughout history; Assassin's Creed is historical science fiction.
The creators did desperately try to make a historically accurate American Revolutionary version, but there were still many historical inaccuracies; here's one example
Adding onto idk's point, in Assassin's Creed: Brotherhood, the protagonist, Ezio Auditore da Firenze, interacts with Niccolo Machiavelli so frequently that it's implied that Machiavelli wrote The Prince about him. I have not gotten around to reading The Prince yet so I can't confirm or deny that Machiavelli featured a character in that book similar to Ezio, but Ubisoft may very well have borrowed qualities from that book for Ezio's character development. However, he is not based on any real historical figure.
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