Mary Lou McDonald has been formally elected as leader of Sinn Féin, replacing Gerry Adams who led the party for almost 35 years.
Mr Adams, 69, announced his intention to quit the role in November in a move that signalled a generational shift in the Sinn Féin leadership.
Ms McDonald, 48, said she was “humbled” to lead “Ireland’s oldest and greatest political party”.
Michelle O’Neill, 41, has also been installed as Sinn Féin vice president.
The elections took place at a special ard fhéis (party conference) in Dublin.
Ms McDonald paid tribute to Mr Adams, saying there would have been no peace process and no Good Friday Agreement without him.
She described him as her political mentor, an “inspirational” leader and a “great friend”.
In her first speech as leader, she warned that Brexit represents a real threat to the prosperity and political life of Ireland.
“There can be no imposition of a border on the island …