The origins of the barricade are often erroneously traced back to the "First Day of the Barricades", a confrontation that occurred in Paris on 12 May 1588 in which the supporters of the Duke of Guise and the ultra-Catholic Holy League successfully challenged the authority of King Henri III. In actuality, although barricades came to widespread public awareness in that uprising (and in the equally momentous "Second Day of the Barricades" on 27 August 1648), none of several conflicting claims concerning who may have "invented" the barricade stand up to close scrutiny for the simple reason that Blaise de Monluc had already documented insurgents' use of the technique at least as early as 1569 in religiously based conflicts in southwestern France.