[1] It is a five-tier order, whose titles are awarded for relevant services to Portugal and for services in the expansion of the Portuguese culture, its history and its values (with a particular focus on its maritime history).

The number of members in each grade is restricted by its constitution, and titles are conferred by special decree by the Grand Master of the Order, i.e., the President of Portugal.

The order includes several classes; in decreasing order of seniority, these are: There is also a Silver Medal (Medalha de Prata – MedPIH) and a Gold Medal (Medalha de Ouro – MedOIH).

The special distinction of Grand Collar can be awarded only to heads of state.

Ribbons and medals are characterized by equal stripes of blue, white and black (either horizontal or vertical) and a ruby-enameled golden cross pattée.