What's the best historical novel ever written?

This is a question I've been struggling with for a long time.<br><br>I read about Marco Polo in "In Xanadu" by William Dalrymple. <br><br>About WW2 in "All The Light We Cannot See" by Anthony Doerr.<br><br>About the Thirty Years War in "The Hangman's Daughter". <br><br>About the ancient Greeks in "Song of Achilles" by Madeline Miller.