National Treasure

The national treasure is, under Portuguese law, the designation reserved for movable assets granted the highest level of heritage protection. It does not refer to a specific object, building, or collection but to a legal status: that of a movable asset classified as of national interest. This concept was introduced by the Cultural Heritage Framework Law, enacted by Law No. 107/2001 of September 8, whose Article 15(3) stipulates that “for movable assets classified as of national interest, the designation ‘national treasure’ is created.”

Context within the classification of movable heritage

The legal protection of movable cultural assets is based on classification and inventory. As with immovable heritage, the law provides for three levels of classification, depending on the recognized cultural significance:

• national interest, when the safeguarding and enhancement of the asset represents a cultural value of significance to the Nation — the category to which the designation of national treasure applies;
• public interest, when the cultural value is of national importance but the stricter protection regime of national interest would be disproportionate;
• municipal interest, when the cultural value is primarily significant to a specific municipality.

The detailed framework was established by Decree-Law No. 148/2015 of August 4, which sets out the rules for classifying and inventorying movable cultural assets, as well as the norms applicable to their export, dispatch, import, and admission. Classification always results from an administrative procedure that concludes with a final act, subject to the opinion of the National Council of Culture.

Effects of the status

Recognizing an asset as a national treasure entails the most stringent protection regime in the legal framework. The most distinctive effect is the restriction on movement: the removal of assets classified as of national interest from national territory is, in principle, prohibited. The law only permits temporary removal for cultural or scientific purposes, with authorization from the government member responsible for culture; for state-owned assets, permanent removal can only be exceptionally authorized by the Council of Ministers, as part of an exchange for foreign cultural assets of exceptional interest.

Additional safeguards include the impossibility of acquiring classified assets of national or public interest through adverse possession and reinforced rules for conservation and market circulation. Private assets can only attain this status if their degradation or loss would constitute irreparable damage to cultural heritage, giving the category an exceptional character.

The status also aligns with international instruments combating the illicit trafficking of cultural assets, as classification as a national treasure supports requests for the restitution of illicitly exported assets and justifies export controls required by European Union law and UNESCO conventions.