
Yes. A clean criminal record is part of naturalisation, and serious convictions can lead to refusal; you must submit a criminal record certificate as part of the application.
Good character and the absence of serious criminal history are part of the assessment for Portuguese naturalisation. Applicants must provide a criminal record certificate, and a serious conviction can be grounds for refusal.
Not every minor matter is automatically disqualifying, but you should disclose your record accurately and obtain the required certificates from the relevant countries. If you have any criminal history, it is sensible to get tailored advice before applying so you understand how it may affect your case.
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