More specifically, could you describe key interactions between Church and State involving the Sack of Constantinople along with the events leading up to it and the effects of it. This is a top option for my formal research paper and I would greatly appreciate it if you supplied me with credible sources backing up your responses. Thanks!
There are some very good papers and academic journals written by historians, and many of them can be accessed via JSTOr, perhaps that may be a place to begin your research. Good luck!