What professorship did Newton hold at Cambridge?

Newton held the Lucasian Professorship of Mathematics at the University of Cambridge. The stored answer, Lucasian Professor, is the customary shortened form of the title and identifies the correct Cambridge post.

Newton was appointed to the chair in 1669, succeeding his former teacher Isaac Barrow, who had resigned the position. The Lucasian Professorship was founded in 1663 through a bequest from Henry Lucas, a Member of Parliament and former Cambridge student. Its full title is the Lucasian Professor of Mathematics.

The position gave Newton an important academic base during a period when he was developing influential ideas in mathematics, optics, and mechanics. He held the chair until 1702, when he resigned after moving more fully into public service and his work at the Royal Mint. The professorship later became associated with other leading mathematicians, including Charles Babbage, George Stokes, Paul Dirac, and Stephen Hawking. It should not be confused with the Mastership of Trinity College, another office Newton held later in life.