1. Citizenship application: Essential for proving lineage for Portuguese or Italian citizenship.

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2. Visa & Residency applications: Required documentation for obtaining visas or residency in Portugal or Italy.

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3. Family reunification: Necessary for bringing family members to Portugal or Italy.

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4. Marriage registration: Required for legal marriage in Portugal or Italy.

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5. Educational purposes: Needed for enrollment in schools or universities in Portugal or Italy.

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6. Proof of identity: Serves as an official document to verify identity in both Portugal and Italy.

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7. Inheritance matters: Required for dealing with inheritance or estate issues in Portugal or Italy.

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8. Social Security benefits: May be needed to access social security or benefits in Portugal or Italy.