In no particular order:
The Middle East: A Brief History of the Last 2,000 Years by Bernard Lewis. I’ve already started this, I just need to finish it.
The Mongoliad: Book One by EVERYONE, but mostly because Neal Stephenson.
The Witches of Karres by James H. Schmitz.
War Maid’s Choice: N/A (The Bahzell) by David Weber. When it comes out next month.