Bembo was the Venetian ambassador to the court of
Henry IV of Castile in 1468–1469. On 16 July 1471, he was commissioned as ambassador to
Charles the Bold,
Duke of Burgundy. On 18 June 1472, he signed the
Treaty of Péronne, creating a five-year alliance between Venice and Burgundy. After a three-year stay at the Burgundian court, he was appointed ambassador to
Sigismund, Archduke of Austria, on 23 August 1474. For this he was praised in an epigram of
Cristoforo Landino. The latter part of his term in Ravenna was taken up by the
War of Ferrara, which began in May 1482. On 9 July 1483, Bembo was appointed ambassador to
England. On 13 February 1484, he was made ambassador to
France. No details about either mission survive, although
Domenico Malipiero in his
Annali says that Bembo went to England. He had returned to Venice by early 1485, when he was elected one of four ambassadors to pay homage to
Pope Innocent VIII. He served a first term as
avogadore di comun (public prosecutor) in 1486, a role he reprised another five times (1494–1495, 1500, 1504–1505, 1509–1510, 1512–1513). Bembo was tried for fiscal improprieties and acquitted by the
Council of Ten on 22 October 1487. He returned to Rome in November 1487 as the Venetian representative at the papal arbitration of the Republic's dispute with Sigismund of Austria, which had led to the brief
War of Rovereto in the
Tyrol. He was still in Rome in October 1488, when he was elected
podestà of
Bergamo. He served for two years (1489–1490), during which he revised the municipal statutes. In October 1492, he was chosen by the
Senate to be a member of the
zonta (an extraordinary commission of the senate), a position in which he served uninterrupted for many years. On 1 October 1496, he joined the Council of Ten. He conveyed to the council the offer of Tristano Savorgnan to poison
Charles VIII of France, then
invading Italy. The Council rejected the proposal. His term was cut short by his appointment as
visdomino of Ferrara in July or August 1497. As
visdomino, Bembo reported on the anti-Venetian hostility of
Ercole d'Este, Duke of Ferrara, yet he also forwarded to Venice Ercole's offer to mediate the end of the
Pisan War, in which Venice had taken the side of
Pisa against Florence. Ercole issued his award, detrimental to Venice, on 26 April 1499. Bembo reported to the
College in Venice on 21 July 1499. On 15 November, he was elected to the
Dieci Savi. In 1500, he rejoined the Council of Ten and was its head in March and May. Between August and December 1500, he was a
governatore delle entrate. On 30 September 1501, Bembo was a ducal elector in the election that chose
Leonardo Loredan. From 10 April 1502 until mid-1503 he was
podestà of
Verona, in conjunction with which he was also to act as ambassador to King
Louis XII of France, who was
invading Italy. For this reason he was away from Verona between 15 June and 28 August 1502, first at
Pavia and from 27 July at
Milan. He describes the triumphal entry of Louis XII in Milan in a letter to
Marino Sanuto the Younger. In Verona, he entertained
Francesco Gonzaga, Marquis of Mantua, and his wife,
Isabella d'Este. ==Final embassy and last years in Venice==