(n): the person who holds the office of head of state of the United States government
(n): a legendary king of the Britons (possibly based on a historical figure in the 6th century but the story has been retold too many times to be sure); said to have led the Knights of the Round Table at Camelot
(n): an imaginary person represented in a work of fiction (play or film or story)
"Arthur McBride" is a song by Planxty.
Just as I suspected.
Sshhhhh! Alter egos, you know...
You know, you never see those two in the same room together....
No, this would be Arthur C. Clarke. ;-)
I presume you're not referring to Chester A. Arthur, then?
Much beloved sidekick to the much beloved Tick. (Editorial gushing mine...)