What is ANCIENT LIGHTS? Definition of ANCIENT LIGHTS in Black's Law Dictionary
Lights or windows in a house, which have been used in their present state, without molestation or interruption, for twenty years, and upwards.
To these the owner of the house has a right by prescription or occupancy, so that they cannot be obstructed or closed by the owner of the adjoining land which they may overlook. Wright v. Freeman, 5 Har. & J., Md., 477; Story v. Odin, 12 Mass. 160, 7 Am.Dec. 81.