Lucius / Lucifer Jr. played by Rex Ingram. His voice was so distinctive
It only took a second to recognize his. I grew up watching re-runs of "The thief of Bagdad" every time it played on TV.
If you have seen both movies you will know who the actor is. If you have watch both movies you cam look it up
Go to 51:10 in this utube video close your eyes and listen to the voice.
https://www.youtube.com/watch?v=i6F-WBkL8nw
The most important thing is sincerity. If you can fake that you've got it made.