Throughout history there have been several pandemics, with some arguably much worse than Covid-19 in terms of the number of people who succumbed to the disease.
Let me highlight a few of these, starting with  - The Antonine Plague (165 AD-180 AD) which was also known as the Plague of Galen and killed over 2,000 people per day at the height of that pandemic; - The Black Death (1347-1352) which swept through Europe and Asia among other continents, and killed an estimated 25 million people; - The Small Pox Pandemic (1870-1874) which spread from Europe to Asia through America, causing 500,000 deaths worldwide.