Ten Years Later: The Man in The Iron Mask by Alexandre Dumas Chapter 1 Page 58

“And that the doctors and jurists assert that there is ground for doubting whether the son that first makes his appearance is the elder by the law of heaven and of nature.”

The prisoner uttered a smothered cry, and became whiter than the coverlet under which he hid himself.

“Now you understand,” pursued Aramis, “that the king, who with so much pleasure saw himself repeated in one, was in despair about two; fearing that the second might dispute the first’s claim to seniority, which had been recognized only two hours before; and so this second son, relying on party interests and caprices, might one day sow discord and engender civil war throughout the kingdom; by these means destroying the very dynasty he should have strengthened.”