Original meaning
Originalists of all stripes cite "The Federalist Papers". It is fairly tenuous to suggest that this represents a good source for the original "intent": after all, Alexander Hamilton, who wrote the majority of those essays, was absent for the greater part of the Philadelphia Convention, and John Jay did not attend it at all. However, James Madison, the principal framer of the Constitution also wrote a substantial amount of "The Federalist Papers". Also, to suggest Hamilton and Jay's absence from the convention implies their ignorance as to the Constitution's original meaning is demeaning to those two men and inaccurate. The collected anti-Federalist papers, of course, will be no use at all to a person searching for the original "intent" of the framers. However, as evidence of how a reasonable person at the time would have understood the words of the Constitution, "The Federalist Papers" and the anti-Federalist essays are evidence of direct relevance.
History of New York (state)
The state adopted its constitution in April 1777, creating a strong executive and strict separation of powers. It strongly influenced the federal constitution a decade later. Debate over the federal constitution in 1787 led to formation of the groups known as Federalists—mainly "downstaters" (those who lived in or near New York City) who supported a strong national government—and Antifederalists—mainly upstaters (those who lived to the city's north and west) who opposed large national institutions. In 1787, Alexander Hamilton, a leading Federalist from New York and signatory to the Constitution, wrote the first essay of the "Federalist Papers". He published and wrote most of the series in New York City newspapers in support of the proposed United States Constitution. Antifederalists were not swayed by the arguments, but the state ratified it in 1788.