Thousands of people are taking part in a parade in east Belfast to mark the 100th anniversary of the foundation of the Ulster Volunteer Force.
The UVF was set up in 1913 to oppose Home Rule.
The parade will make its way around east Belfast before a rally at Craigavon House where the original UVF was formed.
Organisers said between 8,000 and 10,000 people were taking part in the march.
Many are dressed in period costumes and some are carrying replica firearms of the type smuggled into Northern Ireland to oppose home rule at that time.
The organisers of the parade said the event was marking the founding of the historical UVF and had nothing to do with the modern-day paramilitary group.
A rally is getting underway at Craigavon House, off the Circular Road, the former headquarters of the UVF
Spectators are lining the route and traffic diversions have been put in place.