In general, people acquire Portuguese citizenship in one of three ways: wish-effect, adoption, or naturalization. The relevant item here, however, when a candidate is married to a Portuguese citizen, is a wish-effect. Portugal grants citizenship to the spouse or legally recognized cohabitant of a Portuguese citizen via wish-effect. More simply, the person must declare their wish to be Portuguese.
I. Persons married to a Portuguese citizen for at least three years are eligible for citizenship, regardless of residency provided they meet the following criteria:
A. Demonstrate sufficient knowledge of the Portuguese language;
B. Maintain active ties to the national community;
C. Possess no convictions with a prison sentence of more than three years;
D. Do not serve as a civil servant to a foreign state;
E. Cannot have rendered non-compulsory military service to a foreign state.