https://www.history.com/topics/black-death - History Channel article on the initial spread of the plague, its impact on Europe, symptoms of infection, and the impact on religion and society.
https://www.britannica.com/event/Kamakura-period - Encyclopedia Britannica entry that covers the Kamakura period in Japan, focusing on the establishment of feudalism.
https://www.britannica.com/event/Renaissance - Encyclopedia Britannica entry about European Renaissance. It discusses the rise of humanism, various artistic achievements, as well as the High Renaissance period.
https://www.youtube.com/watch?v=UN-II_jBzzo – Crash Course video about the history of the relationship between the Ottoman Empire and the Venetian Republic. It discusses the importance of their relationship and explains how it impacted the future.