I will clarify what I’ve said here and on other threads because I don’t think I’ve been as clear as I might wish: There is much about the methodologies of historians which overlaps with the scientific method. Historians do employ empiricism where appropriate. Nevertheless, history is not a science. That is one of the reasons why the courses offered by the Dept of History at any major university are associated with the humanities requirement for Bachelor’s degrees—not course credits towards the science requirement.
Much of the work of historians involves studying the writings of authors of centuries past, even ancient centuries past. In some cases, historians must study historians of the past who were quoting writers from many years prior. Because there may be little to no empirical data available for past events, analysis of the writings of ancient commentators may be all that historians have to consider. (In contrast, scientists focus on evidence, not just what scientists of the past have written and believed. When scientists quote from past documents, they are focusing on the evidence and analysis contained in those published academic texts.) Yes, empiricism often arises in the peer-review journals of historians. But that doesn’t mean that empiricism is the primary focus.
Was there are an ancient mathematician named Euclid? Most likely yes. However, we can’t pose an experiment to verify his existence. We do have the testimony of some ancient writers—although not any contemporary writer, and the textual evidence is tiny compared to the abundant documentary evidence for an ancient person like Jesus of Nazareth. It is also difficult for historians to determine what mathematical ideas were original to Euclid versus simply compilations he collected from many centuries of mathematicians before him.
My point is that while empiricism is certainly employed by historians, there are good reasons why you most historians are not considered scientists and why you don’t find much mention of the scientific method in most undergraduate science textbooks. The best scientists and historians share many methodologies in common but these two domains of academic disciplines do not entail identical methodologies and primary emphases.