The Great Council was created as part of the government reforms of 1172, which also created a system for electing the doge. All the nobles were part of the Great Council, and by 1297 the Great Council and the nobility were synonymous. Any role the arengo, the old popular assembly, had played in governing was eliminated. In the early 14th century “the Great Council was the sovereign organ of government and the keystone of the system.” (Crouzet-Pavan)
The sovereignty of the Great Council didn’t last long. As it spun off councils and committees it created centers of power that held it, each other, and the doge, in check.
The main councils were:
THE COUNCIL OF FORTY (Quarantia)— Established as part of the constitutional reforms of 1179, the quarantia was the highest court, consisting of 40 members elected from the Great Council. The three heads of the Forty were part of the Doge’s Council, the Signoria. During the 15th century the Forty was divided into 3 separate Councils: the Quarantia Criminal (criminal law); the Quarantia Civil Vecchia (for civil actions within Venice) and the Quarantia Civil Nuovo (for civil actions within the Republic’s mainland territories).
THE SENATE, which began as a group of advisors, was expanded to sixty members (later 120) and formed the highest legislative body, although the legislation they debated often originated elsewhere.
THE SIGNORIA was the highest level committee, consisting of the Doge, his six counselors, and the three heads of The 40. The doge was not allowed to choose his own advisors according to his inclinations. They were elected by the Great Council, they could veto the doge, and he was bound by his oath to submit to them. The shroud of Marino Faliero painted over his portrait in the Great Council Chamber served as memento mori to every subsequent doge that the axe was never far.
The terms of all committee assignments, highest to lowest, were strictly limited, from three to twenty-four months, and consecutive terms were not allowed (in fact, a noble needed to be off a committee twice as long as he he had been on before he could be reelected to the same committee).
THE DOGE
The complex system of electing the Doge began with the constitutional reforms of 1172 and was completed in 1296. The process mingled straightforward voting in committees with lotteries to determine who would be on the committees. Chance — the randomness of the lottery — was seen as a foil to cabals and conspiracies. By the 14th century no noble elected doge was allowed to refuse the office, abdicate, or otherwise resign.
The doge swore an oath of office, which grew over time. Upon the death of each successive doge, his actions were examined. If, post mortem, he was found guilty of any malfeasance or corruption, his family got the bill; another measure designed to keep him in line. By the last doge (1797) the oath was 301 pages of rules and restrictions. The doge was constantly under strict surveillance: he had to wait for other officials to be present before opening dispatches from foreign powers; he was not allowed to possess any property in a foreign land, nor hold private discussions.
Progressively the doge became as much a figurehead as the golden statue of Justice on the prow of the Bucintoro, his golden boat.
THE COUNCIL OF TEN
The government power structure of the Venetian Republic is often visualized as a pyramid (as in the diagram on the right).
This image fails to take into account that after the 12th c. the power of the doge was increasingly limited, his prerogatives taken away, and his freedom of action curtailed until he became a figurehead with no independent power at all.
The “pyramid” also fails to take into account the fact that membership on the councils was interchangeable, a revolving door of members drawn from the same pool cycling through interlocking committees and councils.
A far more accurate representation would look something like the intricate cogs and gears of a clock, with the Council of Ten as the mainspring, simultaneously driving and restraining the operations of the mechanism, its smooth operation regularly interrupted by random events.