Pope Leo II became the bishop of Rome.
Source
The Bank of Italy opened in San Francisco, California, and would later become Bank of America.
Balloonist John Wise started the world's first airmail service by balloon from Lafayette to Crawfordsville, Indiana.
Younes Abouyaaqoub drove a van into pedestrians on La Rambla in Barcelona, Spain, killing 14 people and injuring at least 130 others.
William B. Purvis patented the electric switch on railways that would shut off the electric supply after carriages pass the contact device.
American swimmer Michael Phelps became the first person to win eight gold medals at one Olympic Games.