Nobility. Italian military and politician, the youngest of three children (one female and two boys) of Don Diego d'Avalos, 7th Marquis of Vasto, 11th Marquis of Pescara, 1st Prince of Isernia, and of Francesca Carafa of the Roccella princes. He was baptized in the church of S. Maria Maggiore in Vasto on January 19, following the premature death of his son and heir of his elder brother (Diego Francesco d'Avalos, 1672-1690, son of Francesco d'Avalos, 1651-1672), Cesare Michelangelo got the assets and the title of Marquis of Pescara. Upon his father's death in 1697, he inherited the titles of Marquis del Vasto and Prince of Isernia and Francavilla, as well as bringing together all the privileges and lordships of the family in his person, totaling over 30 titles and predicates. His marriage with Ippolita d'Avalos di Troia, daughter of Giovanni d'Avalos d'Aquino, prince of Troy, celebrated on June 28, 1692, allowed him to reunite the two branches of the family, the Abruzzese and the Apulian ones. The couple, however, had no children. The Marquis Cesare Michelangelo donated to the church of S. Maria Maggiore, in Vasto, on November 3, 1695, the body, intact, of the holy martyr Cesario, together with a glass ampoule that it contained his blood. In 1698 Cesare Michelangelo sold Isernia with the allotment fiefdom to Don Fulvio di Costanzo, prince of Colle d'Anchise, lord of Bojano and regent of His Majesty's Collateral Council, for the sum of 62,000 ducats. Following a series of disputes that arose between the city and the new lord, Cesare Michelangelo repurchased the city in 1710 for 57400 ducats. Cesare Michelangelo d'Avalos was also involved in the succession disputes that resulted from the death without direct heirs, in 1703, of Giulia Carafa (who had married Federico Carafa of the Bruzzano dukes without having children), sister of Carlo Maria Carafa. The latter had married Cesare Michelangelo's sister, Isabella d'Avalos and was also his cousin (as his father Fabrizio was the brother of Francesca Carafa, mother of d'Avalos). Leopoldo I of Habsburg conferred on Cesare Michelangelo by means of a privilege dated 12 March 1704 various awards, including that of heir of the Carafa di Roccella as regards the Calabrian possessions (the Sicilian possessions including the principality of Butera had already been recognized according to the local law of succession to the Branciforte in the person of the second prince of Leonforte, Giuseppe, husband of Caterina Branciforte, sister of Agata and Giuseppe and therefore aunt of Carlo Maria). In a few years, however, the situation was decided in favor of Vincenzo Carafa (nephew of the aforementioned Federico Carafa), exponent of the branch of the Carafa di Bruzzano, in 1707, following a transaction between the Regio Fisco, the d'Avalos and the Carafa, the latter saw himself recognized with a ruling by the Royal Chamber of Summary as the owner of the feudal state of Roccella. Cesare Michelangelo d'Avalos distinguished himself both as a patron of the arts and as a person of vast cultural interests, despite not having received a formal education. In his Vasto residence, Palazzo d'Avalos, he had set up a library of eight hundred and thirty volumes. The care of this library was entrusted, starting from 1720, to the illustrious scholar Alessandro Pompeo Berti.