Portugal - Passport & Nationality - Portuguese Citizenship (Naturalisation)
Provided that:
He/she is an adult or has been legally emancipated under Portuguese law; AND
He/she has sufficient knowledge of the Portuguese language; AND
He/she has not been convicted for a crime punished with imprisonment for 3 or more years.
Portuguese nationality may also be acquired by an individual with legal residence in Portuguese territory for at least 5 years in the following cases:
By marriage with a Portuguese for more than 3 years provided that the foreign individual issued a statement during the marriage declaring that the he/she wants to adopt the Portuguese nationality; OR
By a de facto union with a Portuguese for more than 3 years pursuant to a court decision recognizing the existence of such union.