Morosini took office at a time when relations between Venice and two of its long-time allies,
Byzantine Greece and the
Normans, were beginning to deteriorate. After the death of his father, emperor
Alexios I Komnenos, in 1118,
John II Komnenos refused to confirm the 1082 treaty (a
chrysobull) with the Republic, which had given it unique and generous trading rights within the Byzantine Empire (there would be no import duties on Venetian shipments to and from the territories of the Empire). An incident involving the abuse of a member of the imperial family by Venetians led to a dangerous conflict, especially as Byzantium had depended on Venice for its naval strength. After a Byzantine retaliatory attack on
Kerkyra, John II exiled the Venetian merchants from
Constantinople, but this produced further retaliation, and a Venetian fleet of 72 ships plundered
Rhodes,
Chios,
Samos,
Lesbos,
Andros and captured
Kefalonia in the
Ionian Sea. Relationships with the Normans deteriorated when Venice supported (through its fleet under Naimero and Giovanni Polani, sons of Morosini's predecessor
Pietro Polani) a Byzantine intervention to suppress an uprising at Cape Malea (one of the
peninsulas in the southeast of the
Peloponnese in
Greece) in 1149. The 1148 conquest of the
Istrian city of
Pula, a key port in the peninsula, was followed by an insurgence which Morosini suppressed with atypical shrewdness: in 1150, reconquered Pula swore fealty to the Republic of Venice, thus becoming a Venetian possession. For centuries thereafter, the city's fate and fortunes would be tied to those of Venetian power. Morosini's foreign policy sought a rapprochement with the
Holy See, which had excommunicated the city of Venice because of its familiarity with the Byzantine Empire (and, thus, its schismatic religion). The doge extended an olive branch to
Pope Eugene III by consenting, in 1152, to the independence of the Church within the territories of the Republic — a move that immediately warranted the repeal of the excommunication and thus simplified Venetian tradings with Catholic countries. Further recognition of renewed collaboration came in 1154, when
Pope Anastasius IV raised the doge
dominator Marchiæ (lit. "ruler of
Marche"). Morosini's reconciliation with the Church had positive effects on domestic policy as well, by bridging a long-standing feud between the Polani and Dandolo patrician families.
Enrico Dandolo had been
Patriarch of Grado at a particularly tense time between Venice and the pontificate, which had caused the Polani family, strong supporters of the Pope, to break relations with the Dandolos. In an attempt to reconcile the factions that had coalesced around the two families among the patricians, Morosini pushed for a ''mariage d'affaires'' between Andrea Dandolo, grandson of Enrico, and Primera Polani, niece of the previous doge. During Morosini's dogeship, the construction of
St Mark's Campanile was finally completed. ==References==