Answer:
John Locke.
Explanation: From whom we derive the Lockean Triad of Life, Liberty, and Property that Thomas Jefferson restated as Life, Liberty and the Pursuit of Happiness in the Declaration of Independence. In Locke's time, and during the founding, "property" in land was considered by all, except monarchs and tyrants, to be given by God to all men in common.
What Locke said in the Second Treatise, Chapter V (On Property) [sec. 25] was:
"God, as king David says, Psal. cxv. 16. has given the earth to the children of men; given it to mankind in common."
Sec. 26. God, who hath given the world to men in common, hath also given them reason to make use of it to the best advantage of life, and convenience. The earth, and all that is therein, is given to men for the support and comfort of their being. And tho' all the fruits it naturally produces, and beasts it feeds, belong to mankind in common, as they are produced by the spontaneous hand of nature; and no body has originally a private dominion, exclusive of the rest of mankind, in any of them, as they are thus in their natural state:...
Sec. 27. Though the earth, and all inferior creatures, be common to all men, yet every man has a property in his own person: ...
For his labor being the unquestionable property of the laborer, no man but he can have a right to what that is once joined to, at least where there is enough, and as good, left in common for others. — John Locke (1690)
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Incidentally, a statement from John Stuart Mill is often erroneously attributed to John Locke:
When the sacredness of property is talked of, it should be remembered that any such sacredness does not belong in the same degree to landed property.
