John Cook (1608 – 16 October 1660) was the first Solicitor General of the English Commonwealth and led the prosecution of Charles I. Following the English Restoration, Cook was convicted of regicide and hanged, drawn and quartered on 16 October 1660. He is considered an international legal icon and progenitor of international criminal law for being the first lawyer to prosecute a head of state for crimes against his people.
John Cook was the son of Leicestershire farmers Isaac and Elizabeth Cook whose farm was just outside Burbage. He was baptised on 18 September 1608 in the All Saints church in Husbands Bosworth and educated at Wadham College, Oxford, and at Gray's Inn. Cook and his wife Frances had a son (name unknown) and a daughter, Freelove, who was still a baby in 1660 when Cook was executed. Prior to his appointment as prosecutor, he had established a reputation as a radical lawyer and an Independent.
Mr. John Coke, late Chief Justice of Ireland, had in his younger years seen the best part of Europe; and at Rome had spoken with such liberty and ability against the corruptions of that Court and Church, that great endeavors were used there to bring him into that interest: but he being resolved not to yield to their solicitations, thought it no longer safe to continue among them, and therefore departed to Geneva, where he resided some months in the house of signor Gio. Diodati, minister of the Italian church in that city; after which he returned to England and applied himself to the study of laws; and in that profession became so considerable, that he was appointed by the High Court of Justice to be their solicitor at the King's trial.