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Portugal — Reacquiring Lost Citizenship
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This is one of the cleanest routes in Portuguese nationality law, and it is a declaration rather than an application.
Under the law that applied before 1981, a Portuguese woman who married a foreigner could lose her nationality by that fact alone. The current law reverses it: she reacquires it by declaration, and where the loss was never formally registered she is treated as never having lost it unless she says otherwise.
Two features make this better than an ordinary claim. The opposition procedure does not apply — the public prosecutor cannot object on the grounds of insufficient ties. And the effect is backdated to the date of the marriage, not the date of the declaration.
That backdating is the part worth acting on. If you had children after that marriage, the reacquisition makes you Portuguese at the time of their birth, which makes them the children of a Portuguese mother — and so able to register as Portuguese by origin themselves, whatever their age now. The same then flows to their children as grandchildren of a Portuguese citizen, though that generation faces the tests added in 2026.
What to bring: your Portuguese birth record, your marriage certificate, and documents showing the loss if it was registered. The declaration is made in person at a Portuguese consulate or with the central registry.