Final answer:
Florence Nightingale lived in the 19th century and made significant contributions to nursing and epidemiology during the Crimean War.
Step-by-step explanation:
Florence Nightingale lived in the 19th century, specifically during the Crimean War in the mid-1800s. She was a British nurse who is considered the founder of modern nursing and made significant contributions to the field of epidemiology. Nightingale kept meticulous records of the causes of illness and death during the war, which led to important reforms in medical care and sanitation practices.