Saturn, Jupiter, and Mars came into alignment. Medieval scholars believed this phenomenon brought forth the Black Death.
According to scholars at the University of Paris, the Black Death is created on March 20, 1345, from what they call “a triple conjunction of Saturn, Jupiter and Mars in the 40th degree of Aquarius, occurring on the 20th of March 1345″. The Black Death, also known as the Plague, swept across Europe, the Middle East and Asia during the 14th century, leaving an estimated 25 million dead in its wake.