SIDNEY (or [[Sydney), Algernon]] (1622-1683), English politician, second son of Robert, 2nd earl of Leicester, and of Dorothy Percy, daughter of Henry, 9th earl of Northumberland, was born at Penshurst, Kent, in 1622.
In May 1636 Sidney went with his father to Paris, where he became a general favourite, and from there to Rome.
Whether this was intended by Sidney or no, it is certain that from this time he ardently attached himself to the Parliamentary cause.
Leaving London on 1st of February 1647, Sidney arrived at Cork on the 22nd.
That Sidney approved of the trial, though not of the sentence, there can, however, be little doubt, for in Copenhagen he publicly and vigorously expressed his concurrence.