According to Hanson, the siege of Jerusalem was probably the single greatest loss of life in a single place in Antiquity: probably 400,000 killed.
Did you get that from “A War Like No Other: How the Athenians and Spartans Fought the Peloponnesian War”?
I really enjoyed that one. Great book.
Perhaps as many as one million.
https://www.jewishvirtuallibrary.org/the-great-revolt-66-70-ce
The pedophile Emperor Hadrian banned circumcision, helping to bring on the second revolt, known as Bar Kochba.
https://kids.britannica.com/students/article/Second-Jewish-Revolt/604858
sidebar, the Josephus Problem:
https://www.youtube.com/watch?v=uCsD3ZGzMgE