But Commodus already shares the throne with you.

2 seconds sound clip from the The Fall of the Roman Empire (1964) movie soundboard.

You can hear this line at 00:21:38.762 in the Blu-ray version of the movie.

Quote context

[...]

- Commodus must never be my heir.

- Livius, it is my wish that you should succeed me. And I intend to present you to the leaders of the empire, openly, as my successor.

- But, you said yourself, Caesar. It needs someone who will change, who will find new ways. A man of the tenth century of Rome.

- I know only the ways of war. I would not know how to make allies out of the barbarians.

- You will find new ways. You have a heart for it, Livius.

- But Commodus already shares the throne with you.

- I had hoped that position and responsibility would make him grow up. But he is interested only in games and gladiators.

- But it was you, Caesar, who brought me into your family.

- Commodus and I are like brothers.

- I love Commodus, too. But that's just a feeling. A personal feeling.

[...]