Originally from Zaragoza, Cussida was in Rome by at least 1596, when he is a regular customer of the bank Herrera & Costa. He is known to have had a wife, Giulia Martinez, by whom he had two sons, Gianfrancesco (or Giovan Francesco) and Luigi, who became a Carmelite friar.[1] By 1602 he was serving as diplomat in the service of Philip III (ruled 1598-1621) and then Philip IV (ruled 1621-1665). One of his duties was the procurement of art work for the kings.[2]
Pietro Cussida died in Rome in October 1622.[3] He had gained a remarkable collection of paintings, which he left, along with his palace on the Via del Corso to Gianfrancesco, who died on 23 August 1623 and left the collection to his daughter Laura Cussida (1622-1692), a minor.[2] Laura's guardian, Nicolò Gavotti, eventually inherited the paintings and the family palazzo.[1]