Babbitt’s party politely edged through them and into the whitewashed room, at the front of which was a dais with a red-plush throne and a pine altar painted watery blue, as used nightly by the Grand Masters and Supreme Potentates of innumerable lodges.
There are no more uses of "potentate" in the book.
Show samples from other sources
"I hereby declare, on oath, that I absolutely and entirely renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty, of whom or which I have heretofore been a subject or citizen," Oscar said.
Joshua Davis -- Spare Parts
…she could not afford a phonograph, but no matter; on the inexpensive little portable radio she bought there was splendid music emanating from these stations with weird initials she could never get straight—WQXR, WNYC, WEVD—and men with silken voices announcing the enchanted names of all the musical potentates and princes whose harmonies she had been deprived of so long; even a shopworn composition like Schubert’s Unfinished or Eine kleine Nachtmusik touched her with fresh rapture.