June 21

The young Jesuit Aloysius Gonzaga died in Rome after contracting plague while nursing the sick during an epidemic.

Cardinal Giovanni Battista Montini, archbishop of Milan, was elected pope and took the name Paul VI.

The first International Day of Yoga, proclaimed by the United Nations, was observed around the world on this day in 2015.

At the University of Manchester, the Small-Scale Experimental Machine ran its first program, demonstrating the stored-program principle central to modern computers.