If you weren’t born in Ireland before January 1, 2005, you’ll need to gather the relevant documentation to support your application. These can be acquired from the Foreign Births Register, which allows descendants of the Irish diaspora to claim Irish citizenship by descent. As long as each new generation registers the birth before the next is born, citizenship pass from parent to child in an unbroken chain.As long as applicants have all the relevant documentation to support their claim, they will be able to apply for Irish citizenship by descent.