Final answer:
Marchesa Brigida Spinola Doria, the subject of Rubens' portrait, was associated with the royal court, reflecting her high social status.
Step-by-step explanation:
The portrait of Marchesa Brigida Spinola Doria by Rubens is associated with the fact that she was part of the royal court. The artwork captures Marchesa Brigida in luxurious clothing reflective of her high social standing. Other references to Rubens' works, such as the diplomatic missions he undertook during his career as both an artist and a diplomat, showcase how artists were often close to the royal courts and nobility, offering a look into the intersection of art, society, and politics during that era.