General:
https://www.shughal.com/8-evil-vicious-female-rulers-history/
https://www.insidermonkey.com/blog/10-most-evil-female-rulers-in-history-482272/

Empress Julia Agrippina:
https://www.thoughtco.com/caligulas-sister-julia-agrippina-scandalized-rome-116800

Queen Zenobia, the Warrior Queen of Palmyra:
https://www.thoughtco.com/queen-zenobia-biography-3528385
Empress Wu Zetian
https://www.smithsonianmag.com/history/the-demonization-of-empress-wu-20743091/
https://www.thoughtco.com/empress-wu-zetian-of-zhou-china-195119

Queen Tamar of Georgia:
http://www.ancient-origins.net/history-famous-people/queen-tamar-confident-female-ruler-georgian-golden-age-005815

Queen Isabella I:
http://www.ancient-origins.net/history-famous-people/queen-isabella-i-castile-what-drastic-measures-did-she-take-keep-her-power-021366
Queen Mary I:
http://www.history.com/news/8-things-you-might-not-know-about-mary-i
Queen Ranavalona l:
http://scandalouswoman.blogspot.com/2011/08/queen-ranavalona-i-mad-monarch-of.html:
Countess Elizabeth Báthory:
http://www.history.com/this-day-in-history/bathorys-torturous-escapades-are-exposed

Queen Rani Lakshmi Bai
https://www.britannica.com/biography/Lakshmi-Bai
https://www.atlasobscura.com/articles/lakshmibai-the-warrior-queen-who-fought-british-rule-in-india
Jiang Qing, the Madam of China:
http://content.time.com/time/magazine/article/0,9171,922167,00.html