Don’t let it be forgot
That once there was a spot
For one brief shining moment that was known
As Camelot.

Alan Jay Lerner (1918-1986) American dramatist, lyricist, composer

“Finale Ultimo (Camelot Reprise)” [Arthur], Camelot(1960; 1967)
    (Source)

Based on T.H. White, The Once and Future King (1958).