355 new Irish citizens have been formally sworn in at a ceremony at the University of Limerick at what was the 125th citizenship ceremony since 2011.
More than 100,000 people have now become citizens of Ireland in that time.
The number of British people seeking Irish citizenship since Brexit is up from 42 three years ago to 573 last year.
36 new citizens from the UK were sworn in at the ceremony in Limerick, the third highest number after Poland with 59, and Nigeria with 38.
Many of those from the UK said uncertainty about the future after Brexit was a factor in their determination to become citizens of the Republic of Ireland.
Equality, inclusion, the desire to play a fulfilling role in Irish communities and the right to travel freely in Europe are also factors for others who sought Irish citizenship.
It is anticipated that applications from UK citizens for Irish citizenship will rise further.
Minister Charlie Flanagan who presided over the ceremony in Limerick - his first since becoming Minister for Justice - confirmed there is now an unprecedented demand for Irish passports with over 10,000 applications a week, which has made the process of getting a passport much longer.
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