Have performed a minor copyedit to remove MoS. The lead need to be extended considerably, probably fivefold. Remember to mention all parts of the article; the lead is to summarize, not introduce, the article.
The bibliography section should cite books within {{cite book}}. All-caps titles should be converted to lower caps—all caps is a matter of typography and not grammar or spelling. The first paragraph under "Death of Adrian IV" should be referenced. Ref 25 and 35 should be in the {{cite web}} template.