Molesworth's An Account of Denmark, as it was in the Year 1692 (1694) was somewhat influential in the burgeoning field of political science in the period.

Robert Molesworth was born on 7 September 1656, four days after the death of his father;[1] his mother Judith Bysse later remarried Sir William Tichborne of Beaulieu.

In Parliament, since his colleagues suggested there was no law under which to punish the perpetrators, he called for the Commons to "upon this occasion follow the example of the ancient Romans, who, having no law against parricide, because their legislators supposed no son could be so unnaturally wicked as to embrue his hands in his father's blood, made one to punish so heinous a crime as soon as it was committed; and adjudged the guilty wretch to be thrown alive, sewn up in a sack, into the Tiber".

He concluded that he would see the same punishment applied to the directors of the South Sea Company, calling them the parricides of their country.

His widow, Letitia, died "of a great cold" on St Patrick's Day 1729 and was buried privately in St. Audoen's Church in Dublin.