There is a real chance you already hold a second citizenship and don't know it. Not one you can buy. One that has been sitting there, unclaimed, because of where your grandparents or great-grandparents were born.
This is citizenship by descent, and it's the cheapest, fastest route to a strong second passport that exists. You're not applying for something new. You're proving that a nationality you inherited at birth belongs to you. No investment, no minimum stay, often no need to ever live there.
But the rules are tightening, the reach varies enormously from one country to the next, and one of the biggest doors in the world just slammed shut. So here is the complete picture: how it works, what just changed, and every country worth chasing, sorted by how far back your family line can reach.
What just happened in Italy (and why it's a warning)
For decades, Italy had the most generous descent law on the planet. Trace an unbroken line back to an Italian ancestor alive after 1861 and you qualified, with no generational limit. People claimed Italian citizenship through great-great-grandparents.
That ended in 2025. A decree in March, converted into Law 74/2025 in May, capped descent at two generations. You now generally need a parent or grandparent who was born in Italy. Great-grandparents and anything further back no longer count, unless your case was filed before the 27 March 2025 cutoff. In March 2026, Italy's Constitutional Court reviewed the new law and let it stand.
The scale is staggering. Italy estimated 60 to 80 million people worldwide could have qualified under the old rules. Argentina alone has around 25 million people of Italian descent. Brazil has around 32 million. Most of them woke up one morning and found the route closed.
The people who claimed Italian citizenship in 2023 hold EU passports today. The people who waited hold nothing.
Here's the lesson, and it applies to every country below. These windows do not stay open forever. When a government decides it has handed out enough passports, it changes the law overnight, and "but I was about to apply" means nothing.
How descent actually works
Two things decide almost every case: the chain, and one specific date.
The chain is the unbroken line of citizenship from your qualifying ancestor down to you. You prove it with documents: your birth certificate, your parent's, your grandparent's, plus marriage certificates and the ancestor's emigration and naturalisation records. Each link has to connect cleanly to the next.
The date is the one that breaks most claims. Under a lot of old laws, the moment your ancestor became a citizen of their new country, they lost the original one. If that naturalisation happened before the next person in your line was born, the chain snapped and the citizenship never passed down. If it happened after, you're usually fine. This single fact — when your emigrant ancestor naturalised — decides more cases than anything else. Find that date first.
One more variable: not every country lets you keep your current passport. Some demand you renounce it. That column matters as much as eligibility, so it's in every table below.
The five tiers of reach
Countries differ massively in how many generations back they let you go. That, more than anything, determines whether your family line qualifies. Here are the five tiers, from deepest reach to shallowest.
Tier 1: No generational limit
The deepest reach. If you can document the chain, it doesn't matter how long ago your ancestor left. These are the golden tickets, mostly in Central and Eastern Europe, and they all come with a heavy documentation burden.
| Country | How far back | Main catch | Dual citizenship | EU |
|---|
| Poland | No limit | Ancestor must have held Polish citizenship after 1920 and not lost it (naturalising elsewhere before ~1951 or before the next birth breaks it). | Allowed | Yes |
| Latvia | No limit | For descendants of citizens before June 1940 and of exiles. Over a million people may qualify. | Allowed | Yes |
| Lithuania | No limit (pre-1940 line) | Descendants of pre-June 1940 citizens or those who fled persecution. Dual citizenship is restricted, mainly for the pre-1940 line. | Restricted | Yes |
| Hungary | No fixed limit | Powerful reach, but you generally need to demonstrate basic Hungarian language ability. Shifting historical borders affect eligibility. | Allowed | Yes |
| Croatia | Deep (ethnic Croats) | Members of the Croatian people abroad get broad reach. The route is narrower if you're not ethnically Croatian. | Allowed | Yes |
Tier 2: Up to great-grandparent
Three generations back. Still generous by world standards, and these cover a huge slice of the diaspora.
| Country | How far back | Main catch | Dual citizenship | EU |
|---|
| Slovakia | Great-grandparent | Extended to the third generation in 2021. Over 800,000 Slovak descendants in the US alone may qualify. | Restricted in some cases | Yes |
| Greece | Great-grandparent | Reach is good, but male applicants can face military service obligations. Records must be solid. | Allowed | Yes |
Tier 3: Up to grandparent
Two generations. This is the most common tier, and it includes some of the most practical programmes in the world.
| Country | How far back | Main catch | Dual citizenship | EU |
|---|
| Ireland | Grandparent | Grandparent born on the island of Ireland qualifies you via the Foreign Births Register. Great-grandparent works only if your parent registered before you were born. Success rate for well-documented claims is very high. | Allowed | Yes (plus UK rights) |
| Italy | Grandparent | Capped at two generations since 2025. The great-grandparent era is over unless you filed before March 2025. | Allowed | Yes |
| Czech Republic | Grandparent | Claimable through a parent or grandparent. | Allowed | Yes |
| Spain | Grandparent | Democratic Memory Law opened a grandchild window. Non-Ibero-Americans normally must renounce, which is a problem for US citizens. | Restricted (with exceptions) | Yes |
| Portugal | Grandparent | Grandparent route, plus a separate Sephardic Jewish route that now requires around three years of residency. | Allowed | Yes |
| Romania | Grandparent | Reacquisition route for descendants of former citizens. | Allowed | Yes |
| Malta | Grandparent | Reach limited to grandchildren. | Allowed | Yes |
| Slovenia | Grandparent | Reach limited to grandchildren. | Allowed | Yes |
Tier 4: Parent only (with restoration exceptions)
One generation by default. But two of these carry powerful restoration routes that reach much further for descendants of people stripped of citizenship under persecution.
| Country | How far back | Main catch | Dual citizenship | EU |
|---|
| Germany | Parent (deeper via restoration) | Standard descent is parent-level. But Article 116 restores citizenship to descendants of those stripped by the Nazi regime, and that route reaches much further back. | Allowed | Yes |
| Austria | Parent (deeper via restoration) | Section 58c, opened in 2020, restores citizenship to descendants of people persecuted between 1933 and 1945, with no generational limit on that route. | Allowed (restoration route) | Yes |
| United Kingdom | Parent | Generally a parent born in the UK. Limited reach beyond that. | Allowed | No (post-Brexit) |
| France | Parent | Descent reach is shallow. Parent-level in practice. | Allowed | Yes |
Tier 5: Ethnic and religious routes
These don't follow the usual generation count. They're tied to heritage rather than a clean parent-to-child chain, and a couple are among the most accessible routes on this entire page.
| Country | Basis | Main catch | Dual citizenship |
|---|
| Israel | Law of Return: one Jewish grandparent (or conversion, or marriage) | Strong passport. The travel document you get can depend on time spent in Israel. | Allowed |
| Armenia | Ethnic Armenian descent | Broad heritage-based route. | Allowed |
| Spain (Sephardic) | Descendants of Sephardic Jews expelled in 1492 | The dedicated window closed in 2019. Now far harder. | Restricted |
| Portugal (Sephardic) | Descendants of Sephardic Jews | Tightened: now generally requires around three years of residency. | Allowed |
The standouts worth chasing first
Ireland is the cleanest grandparent route in the world. A grandparent born on the island, a manageable document set, a high success rate, and a passport that gives you the EU plus the right to live and work in the UK, which no other single passport does.
Poland is the most powerful if your roots are Polish. No generational limit at all. The catch is purely evidential: you must prove an unbroken citizenship chain and that your ancestor never formally lost it before the next birth. The eligibility is generous, the paperwork is brutal.
Slovakia, Latvia, Lithuania, and Hungary are the quiet Central and Eastern European routes most people never check. If your family came from that part of the world, the reach is deep. Hungary's language requirement and Lithuania's dual-citizenship limits are the things to read closely before you commit.
Germany and Austria matter for anyone whose family fled persecution in the 1930s or 40s. The restoration routes are more generous than people expect and reach far past the normal one-generation limit.
Israel's Law of Return is one of the most accessible heritage routes anywhere. A single Jewish grandparent can be enough.
A note on Latin America
If your roots are Latin American rather than European, the picture is different. Most countries in the region grant citizenship to the children of citizens born abroad, but few extend descent much past the parent level. The more useful angle is often Spain: citizens of most Ibero-American countries can naturalise in Spain after just two years of residency instead of the usual ten, which turns a Latin American passport into a fast track to an EU one.
The honest part
Descent is the cheapest route to a passport, not the easiest. It is slow and it is bureaucratic. You will chase certificates across countries, get them translated and apostilled, and wait in consular queues that can run well over a year. Some lines look promising and then die on a single missing record or one inconvenient naturalisation date.
But if you qualify, you are getting a full citizenship, often an EU one, for the cost of paperwork and patience rather than a six-figure investment. There is no better deal in this entire field, and it can cover your children and their children too.
The offer has an expiry date you can't see. Italy just proved that to 80 million people. Find your line, check which tier it lands in, and move while the door is still open.
By Erika Botnæs
