Answer:
Dysentery, Scurvy from the trip and food in general. It's why the Galapagos became a pit stop for awhile and they'd roll Tortoises onto the ship as rations later, It apparently tasted good but being a time where everyone was malnourished, the bar was pretty low. Giant tortoise was a part of sea fare. and now their endangered.
Explanation:
Emperor Justinian reconquered many former territories of the Western Roman Empire, including Italy, Dalmatia, Africa, and southern Hispania.
