Algernon Sidney

Algernon Sidney or Sydney was an English politician and member of the middle part of the Long Parliament. A republican political theorist, colonel, and commissioner of the trial of King Charles I of England, he opposed the king's execution. Sidney was later charged with plotting against Charles II, in part based on his most famous work, Discourses Concerning Government, which was used by the prosecution as a witness at his trial. He was executed for treason. After his death, Sidney was revered as a "Whig patriot–hero and martyr".