The Twelfth is a primarily Ulster Protestant celebration held on 12 July. It began in the late 18th century in Ulster. It celebrates the Glorious Revolution and victory of Protestant King William of Orange over Catholic King James II at the Battle of the Boyne, which ensured a Whig political party and Anglican Ascendancy in Ireland and the passing of the Penal Laws to disenfranchise and persecute the nation's Catholic majority, and to a lesser extent Protestant Dissenters, until Catholic Emancipation in 1829. From Wikipedia
