Final answer:
The historical references provided do not explicitly state the cause of death of a prince and a eunuch in Algiers. However, the bubonic plague, caused by Yersinia pestis, and diseases spread through contaminated water such as typhoid fever, were common causes of death during historical epidemics.
Step-by-step explanation:
The death of a prince and a eunuch in Algiers is not explicitly detailed in the provided references. However, considering the historical context and the provided information which touches upon historical plagues and diseases, it could be inferred that the cause of death during such a time period may have been due to a prevalent illness such as the bubonic plague caused by Yersinia pestis. This bacterium has been the causative agent in numerous historic plagues, including the Black Death that ravaged Europe in the 14th century and the Great Plague of London in 1665, killing a large proportion of the population. It is transmitted through the bite of infected fleas carried by rodents, with symptoms including fever, swollen lymph nodes, and in some cases gangrene. Another possible cause of widespread death could be due to contaminated water supplies which could spread diseases like typhoid fever, caused by Salmonella entericaserovar typhi, as seen in the Plague of Athens.