Partly to please his kinsman the earl of Perth, and partly to satisfy his own curiosity, the poet made researches in the genealogy of the family. This investigation was the real secret of Drummond's interest in Scottish history; and so we find that he now began his "History of Scotland during the Reigns of the Five Jameses", a work which did not appear till 1655, and is remarkable only for its good literary style. His next work was called forth by the king's enforced submission to the opposition of his Scottish subjects. It is entitled "Irene: or a Remonstrance for Concord, Amity, and Love amongst His Majesty's Subjects" (1638), and embodies Drummond's political creed of submission to authority as the only logical refuge from democracy, which he hated. In 1639 Drummond had to sign the Covenant in self-protection, but was uneasy under the burden, as several political squibs by him testify. In 1643 he published "Σκιαμαχία: or a Defence of a Petition tendered to the Lords of the Council of Scotland by certain Noblemen and Gentlemen", a political pamphlet in support of those royalists in Scotland who wished to espouse the king's cause against the English parliament. Its burden is an invective on the intolerance of the then dominant Presbyterian clergy.