Brewer's Dictionary of Phrase and Fable/Sidney (Algernon)
Sidney (Algernon), called by Thomson, in his Summer, "The British Cassius," because of his republican principles. Both disliked kings, not from their misrule, but from a dislike to monarchy. Cassius was one of the conspirators against the life of Cæsar, and Sidney was one of the judges that condemned Charles I. to the block (1617–1683).