He was born in New York and graduated Yale College in 1746, returning home to Westchester County to farm. He became involved in politics, serving in the Provincial legislature before it was dissolved by the royal governor. He was sent as a delegate to the second Continental Congress, and served as a brigadier-general in the New York militia. In 1777 he was succeeded in Congress by his brother Gouverneur Morris. Most of his family's wealth had been destroyed in the Revolution. He served on the first Board of Regents for the University of New York.
Lewis Morris (1701-1765) was a Welsh poet and lexicographer, the eldest of the Morris brothers of Anglesey.
He was a surveyor by profession, and worked for the Navy Office and later as a Crown official responsible for the collection of tolls. His bardic name was Llewelyn Ddu o Fon ("Black Llewelyn/Lewis of Anglesey"). The correspondence between him and his younger brothers is a valuable historical source.
Sir Lewis Morris (1833-1907) was a popular poet of the Anglo-Welsh school. He was knighted by Queen Victoria, and narrowly missed being appointed Poet Laureate, possibly because of his association with Oscar Wilde.