Busca, Ignazio an Italian prelate, was born at :Milan in 1713. He was nuncio in the Netherlands before the insurrection of these provinces against Joseph .II. On his return to Italy he was appointed governor -of Rome; became cardinal in 1789; and obtained the confidence of Pius VI, who sent him to Milan. to negotiate with Cacault, sent from France. He failed in this :mission and returned to Rome, where he continued to perform important offices. Later he opposed the Concordat. He died in 1803. See Hoefer, Nouv. Biog. Generale, s.v.; Rose, Gen. Biog,. Diet. s.v.