Your son will not sit long on the throne, I swear it.

6 seconds sound clip from the Braveheart (1995) movie soundboard.

You can hear this line at 02:36:08 in the Blu-ray version of the movie.

Quote context

[...]

- At worst, he was a worthy enemy. Show mercy, O thou great king, and win the respect of your own people.

- Even now, you are incapable of mercy. And you... To you, that word is as unfamiliar as love.

- Before he lost his powers of speech, he told me his one comfort was that he would live to know Wallace was dead.

- You see, death comes to us all. But before it comes to you, know this. Your blood dies with you.

- A child who is not of your line grows in my belly.

- Your son will not sit long on the throne, I swear it.

(CROWD CLAMORING)

(CROWD EXCLAIMING)

- I'm so afraid. Give me the strength to die well.

(CROWD BOOING)

[...]