useless trivia: What Word Means: A First Name - The Father Of Charlemagne?

Questions

Karl Wilhelm Siemens inventor (laid undersea cables), born.?

William Henry Harrison dies of pneumonia and becomes the first U.S. president to die in office.?

Asteroid 54, Kalypso discovered (named for goddess of silence)?

Pony Express begins service, from St. Joseph, Missouri.?

Arthur Murray, dance instructor, born.?