I'm tempted to make a small point here. There is a difference between fads. styles and trends. What is overwhelmingly popular at a given period may well not be what in hindsight is seen to be of most overall significance. Many (all?) movements in art have been against the popular style and opinion, and derided by contemporaries. I have the Impressionists in mind as a very well known example - and, like many movements the name that has stuck has been the one used as originally a derogatory term.
There are two different histories that could be written, if we place things by date - the most popular style (or subject, or philosophy, whatever) or that which has later come to be seen as the most significant. Just in case this is an essay question, and the thread being followed, I'm not sure if I want to be any more specific and just offer this as another suggestion to follow up.
Edit for grammar.