The Queen has sent her “warmest good wishes” to the people of Northern Ireland on the date which many consider to be its centenary.
She referred to “treasured” memories she shared in Northern Ireland with her late husband, the Duke of Edinburgh, and paid tribute to its people.
Prime Minister Boris Johnson also marked the date, describing it as a “very significant national anniversary, marking the 100th year since the Government of Ireland Act came into effect and the formation of the United Kingdom as we know it today”.
In a statement, the Queen paid tribute to the people of Northern Ireland.