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Philipsburg Manor House is a historic house in the Upper Mills section of the former sprawling Colonial-era estate known as Philipsburg Manor.
The manor dates from 1693, when wealthy Province of New York merchant Frederick Philipse was granted a charter for 52,000 acres (21,000 ha) along the Hudson River by the British Crown. He built a facility at the confluence of the Pocantico and Hudson Rivers as a provisioning depot for the family Atlantic sea trade and as headquarters for a worldwide shipping operation.
At the outbreak of the American Revolutionary War, the Philipses supported the British, and their landholdings were seized and auctioned off. The manor house was used during the war, most notably by British General Sir Henry Clinton during military activities in 1779. It was there that he wrote what is now known as the Philipsburg Proclamation, which declared all Patriot-owned slaves to be free, and that blacks taken prisoner while serving in Patriot forces would be sold into slavery.