His Lordship's Kindness, also known as Poplar Hill, is a historic plantation estate on Woodyard Road east of Clinton, Maryland. It was built in the 1780s for Prince George's County planter Robert Darnall. The five-part Georgian mansion retains a number of subsidiary buildings including a slave's hospital and a dovecote. The property is now operated as a museum by a local nonprofit preservation group. It was designated a National Historic Landmark in 1970.