Calvin’s Case - The Selected Writings and Speeches of Sir Edward Coke
http://oll.libertyfund.org/titles/911#lf0462-01_mnt034
3. There be regulary (unlesse it be in special cases) three incidents to a subject born.
1. That the parents be under the actual obedience of the king.
2. That the place of his birth be within the king’s dominion.
3. the time of his birth is chiefly to be considered; for he cannot be a subject born of one kingdom, that was born under the ligeance of a king of another kingdom, albeit afterwards one kingdom descend to the king of the other.
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Sovereignty cannot supplant sovereignty, so unless the alien formally renounces his natural allegiance, he's still an alien.....according to Lord Coke.
And that someone is you.
It's amusing how Birthers try to add the Plan B in: "The Framers didn't follow English law, they followed Vattel; and if they did follow English law, that was like Vattel anyway." Hey, even Vattel said the English follow a different rule. That should be a clue.
Again, here's what Coke earlier in the opinion said:
"Sherley a Frenchman, being in amity with the King, came into England, and joyned with divers subjects of this realm in treason against the Kingand Queen, and the indictment concluded contra ligeant’ suae debitum;51 for he owed to the King a local obedience, that is, so long as he was within the King’s protection: which local obedience, being but momentary and incertain, is strong enough to make a natural subject; for if he hath issue here, that issue is a natural born subject[.]"
So a Frenchman coming into the King's realm, even for a stay of uncertain length, owes a temporary aligeance to the King "strong enough" that a child born in England during that stay would be a natural-born subject. And nothing here is said about renouncing allegiance to France for that to be so.
Is Coke contradicting himself later in the portion you highlight? No.
" albeit afterwards one kingdom descend to the king of the other."
This is the key phrase to understand to what persons Coke has in view here. It's not that French guy. It's someone else.
Let's see if you can figure it out.