The parade celebrates the victory of the Protestant King William of Orange over the Catholic King James II during the Battle of the Boyne in County Meath, Ireland, on July 12, 1690.
The battle was preceded by the Siege of Derry in from June 1688 to August 1689. The 105-day siege saw the forces of Catholic King James II lay siege to the Protestant-stronghold of Londonderry. James had been overthrown by his own daughter, Mary, and her husband, King William of Orange.
Orange Lodges from as far away as Morrisburg and the Pontiac in Quebec took part in the annual Carleton Place parade. At one time they were moved around the area, but they seem to have found a permanent home in Carleton Place.
The parades originated in Ireland, and are most commonly found in what is now Northern Ireland, where this year's parades were commended for passing off without violence.
by Desmond Devoy West Carleton Review