Stormont's Parliament Buildings have been illuminated in red for Armistice Day.
It is one of four days that the Assembly Commission has selected to floodlight the building during the year.
Sinn Fein Speaker Mitchel McLaughlin, who lead a service and two minutes' silence in the Great Hall, said it was important initiative.
He said: "Remembrance is very personal, even private, for many.
"As the Speaker representing an Assembly of diverse views, I am conscious that people will mark remembrance in their own ways being influenced by their own different backgrounds and perspectives.
"Remembrance should be a unifying, not a divisive, concept and my focus is to encourage as many people as possible to be involved in remembrance, regardless of how they choose to do it."
Northern Ireland Secretary Theresa Villiers and Deputy First Minister Martin McGuinness also attended the short service at Stormont.
A separate ceremony of remembrance was also held at the cenotaph at Belfast City Hall.
Stormont is also lit up on St Patrick's Day, the Twelfth of July and on International Women's Day.
Alliance Party MLA Judith Cochrane who campaigned for the Commission to illuminate the building on significant dates, said: "It is good to see cross-party support to commemorate such days in a shared and inclusive way.
"Parliament Buildings is one of the most iconic landmarks in Northern Ireland and can be seen from across Belfast.
"Using it to highlight Armistice Day and other commemorations in such a sensitive way is another important step to ensuring co-operation and maintaining good relations as we aim to build a shared Northern Ireland for everyone."
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