As a young man, Alfonso fought in the service of Henry II of France against the Habsburgs. Soon after his accession, he was forced by Pope Pius IV to send his mother back to France due to her increasingly Calvinist beliefs.[2] The 1570 Ferrara earthquake occurred during his reign. In 1583, he allied with Emperor Rudolf II in the war against the Turks in Hungary.
Throughout the 1550s, Alfonso had an interest in Castrato singing voices. Given his childless marriages, this additional fact has prompted some historians to speculate that the Duke was homosexual.[citation needed]
He had no known children, legitimate or otherwise.
Lucrezia di Cosimo de' Medici
Barbara of Austria
Margherita Gonzaga
Succession
The legitimate line of the House of Este ended in 1597 with him. Rudolf II, Holy Roman Emperor recognized as heir his cousin Cesare d'Este, member of a cadet branch, who continued to rule in the imperial duchies and carried on the family name. The succession as Duke of Este, however, was recognized only by the Emperor but not by the Popes. In 1598 Ferrara was therefore incorporated into the Papal States by Pope Clement VIII, on grounds of doubtful legitimacy. As a result of Alfonso's death Cesare d'Este and his family were "obliged to leave the city" and the power of the government was there after turned over to the cardinal legate.[4]
Patron of the arts and sciences
Alfonso II raised the glory of Ferrara to its highest point, and was the patron of Torquato Tasso, Giovanni Battista Guarini, and Cesare Cremonini—favouring the arts and sciences, as the princes of his house had always done. Besides being fluent in Italian he was also proficient in Latin and French.[5]Luzzasco Luzzaschi served as his court organist.
In addition, he was the sponsor of the Concerto delle donne, a type of group which was to be copied all over Italy. He also restored the Castello Estense, damaged by an earthquake in 1570.
His expenses, however, went at damage of the public treasure.