The peace of his own son--his only son.
[CARLOS looks on the ground in silence.
Is there one dearest wish that bounteous Heaven
Hath e'er withheld from her most favored child?
I stood beside, when in Toledo's walls
The lofty Charles received his vassals' homage,
When conquered princes thronged to kiss his hand,
And there at once six mighty kingdoms fell
In fealty at his feet: I stood and marked
The young, proud blood mount to his glowing cheek,
I saw his bosom swell with high resolves,
His eye, all radiant with triumphant pride,
Flash through the assembled throng; and that same eye
Confessed, "Now am I wholly satisfied!"
[CARLOS turns away.
This silent sorrow, which for eight long moons
Hath hung its shadows, prince, upon your brow--
The mystery of the court, the nation's grief--
Hath cost your father many a sleepless night,
And many a tear of anguish to your mother.

CARLOS (turning hastily round).
My mother! Grant, O heaven, I may forget
How she became my mother!

DOMINGO.
Gracious prince!

CARLOS (passing his hands thoughtfully over his brow).
Alas! alas! a fruitful source of woe