… because he allied himself with Robespierre during the Reign of Terror in France (around 1793). Lucien led the grenadiers in Napoleon’s revolution despite his misgivings about his brother’s ability to lead in the way that Lucien felt the country should be run.
He was successful, but sitting atop his horse after the successful battle that if Napoleon defied “liberte, egalite, fraternite”, he, Lucien would run his brother through with his sword.
Napoleon reluctantly made his brother a french minister in his government.
(portrait: Napoleonic Grenadiers like Lucien)