On May 20, 1484 he was elected archbishop, confirmed by Pope Innocent VIII on September 20, 1484.
In 1475 and 1488, Dorothea visited the reigning popes (Sixtus IV and Innocent VIII) in Rome and her sister Barbara in Mantua.
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In 1488, Pope Innocent VIII sent Cardinal Riario as a legate to his maternal uncle Girolamo Riario, at the time governor of Forlì and Imola, who was revolting against the Holy See.