Spanish citizens can invoke diplomatic protection (patrimonial responsibility) when they are wrongfully damaged by another State Internationally-Tribunal Supreme-15/07/2021

Spanish citizens have the right to diplomatic protection by the national Administration, for compensation for the damages caused by an illegal act, in accordance with to International Law, caused directly by another State; as long as the injured party himself has not been able to obtain reparation through the internal law mechanisms of the State producing the damage, provided that they are established and it is reasonable to obtain an express ruling in a reasonable time

Compact between Spain and Portugal, signed at Madrid-1495

Hence therefore, in order that all this may be done to better advantage, and with the full and free consent of both sides, we agree and by this present letter consent that the said astrologers, pilots, sailors, and others determined upon with the said king, our brother-a like number on either side, and of sufficient number for this matter-must assemble, and they shall assemble, along any part of the frontier of these our kingdoms and the kingdom of Portugal.

Standing Orders of the Senate: Parliament of Spain

When the Senate is constituted on a provisional basis it shall only deal with matters of incompatibility unless that, following a parliamentary initiative or a Government statement, the debate of any other business may be considered indispensable. For the implementation of such initiative, a motion signed by a Parliamentary Group or by twenty-five Senators is required.

Senate Practice-House of Parliament Spain

House of Parliament, which represents the Spanish people (section 66.1 of the Constitution) and which is also the House of territorial or regional representation (section 69.1 of the Constitution). It is made up of Senators who can be elected by electoral districts/constituencies, or appointed by Regional Parliaments.

Constitution of Spain

The Constitution is based on the indissoluble unity of the Spanish Nation, the common and indivisible homeland of all Spaniards; it recognizes and guarantees the right to autonomy of the nationalities and regions of which it is composed and the solidarity among them all.