Langdon, Governor John, Mansion - View this location on map Erected in 1784, this, one of the great Georgian houses of America, was the the residence of John Langdon (1741-18190, a leading figure in New Hampshire merchantile, military and political affairs for more than 40 years. Langdon served as a delegate to the Constitutional Convention in 1787 and as the first President pro tem of the United States Senate. His house was built by local craftsmen who derived details from architectural guidebooks by British author Abraham Stone. 143 Pleasant Street, Portsmouth, New Hampshire Historical

---