I too love history, and in fact am currently (re) reading Barbara Tuchman's "A Distant Mirror: The calamitous 14th Century". I don't know that I can single out any one era as an ultimate favorite. I do have a special fascination with Troy and matters connected with the Trojan War. But I could say much the same for a great many historic periods from before the dawn of civilization up to the industrial revolution and beyond.
I started out as a fan of the American Civil War, as many a lad born in the early 1950s would have been. The Centennial began the year I turned nine, and was treated as a big deal by much of the nation. Heck, a handful of ancient veterans still lived when I was born. In fact I believe the last confederate veterans reunion was held that year. (Those few who survived past then were considered too frail to attend such events.) I own small (?) bookcase full of books related to the American Civil War, and one of equal size to house all other histories. (The majority of my print library is fantasy.)
I have a fascination with and love for early cinema, and own a too small library of silent films on disk, and an even smaller library of books on that era. (There is a wonderful Thames series on American Silent Film that can sometimes be found at YouTube. Alas, for royalty reasons it is not allowed to be sold on disk, at least not in the States.)