Even though the movie is on the whole historically inaccurate there are a few historically accurate details. In Gladiator, the hugeness of the Coliseum is very well and accurately portrayed. The Coliseum is larger then Shea Stadium, and that greatness and grandeur is shown correctly in the film. Also, the movie correctly portrayed the armory of the times. The breastplates were correct and so too were the facemasks and other such battle suits.( http://www.online-shrine.com) The movie shows these true details in order for the viewer to think that the other more amazing parts of the plot are true. Also, by adding the truths it makes sure that the movie will not seem neither phony nor cartoonish.
The reason Gladiator can not be considered historically accurate is because of the glaring errors in the characters and the emotions and actions of the characters. Firstly, Crowe's General Maximus Decimus Meridus is a total fake. He is not a real person nor is he very similar to any one else in history. Maximus is instead a hodgepodge of many other people. The one true person who is totally shown incorrectly is Commodus. Commodus is shown as a grownup that never outgrows his childhood. However, he in fact was not like that at all. In the film Commodus is shown killed is father because his father believed he wasn't fit to rule. In truth Commodus did not kill his. Historians generally agree that, Marcus Aurelius died of the plague in Vienna on March 17, 180 CE