"To apply for citizenship by naturalisation based on residence, you must prove that you have been resident in the State for at least 5 years (1825 or 1826 days) out of the last 9 years.
This includes 1 year (365 or 366 days) of continuous residence immediately before the date you apply."
I've been living in Northern Ireland for 3 years and I'm going to move to Dublin soon and stay at least 2 years.
This 5 year-period has to be spent in either Northern Ireland or Republic of Ireland, right??