Facing Largo do Senado to the west is Macau’s most important historical building, the 18th-century ‘Loyal Senate’, which now houses the Instituto para os Assuntos Cívicos e Municipais (IACM; Civic and Municipal Affairs Bureau). It is so named because the body sitting here refused to recognise Spain’s sovereignty during the 60 years that it occupied Portugal. In 1654, a dozen years after Portuguese sovereignty was re-established, King João IV ordered a heraldic inscription to be placed inside the senate’s entrance hall, and this can still be seen today. To the right of the entrance hall is the IACM Gallery, which features changing exhibits. On the 1st floor is the Senate Library, which has a collection of some 18,500 books, and wonderful carved wooden furnishings and panelled walls.