He was the second son of Thomas Nicholls, serjeant-at-law, by Anne, daughter of John Pell of Ellington, Huntingdonshire.
On 11 February 1603 Elizabeth I summoned him to become serjeant-at-law by taking the degree of the coif; but she died before the writ was returnable, and it had to be renewed by James I. Nicolls was sworn on 17 May following.
[3] His tomb, in black marble and alabaster, was in Faxton Church, Northamptonshire, but was moved to the Victoria and Albert Museum in the 20th century.
[4] Robert Bolton, whom Nicolls had presented to the living of Broughton, testified to his not accepting bribes.
[1] Nicolls married Mary Hemings of London, widow of Edward Bagshawe; they had no children together.