The or () was a board of five senior magistrates of the Republic of Venice, initially charged with the defence of the Republic's possessions in the Italian mainland (). Gradually they assumed specific roles pertaining to the supervision of public finances (the ), the military administration (the and ), state ceremonies (the ), and urgent matters (the ).
The were established , as part of the Republic's expansion into the Veneto and Lombardy, and its military confrontation with the Duchy of Milan over hegemony in northern Italy. They were probably the direct descendants of the extraordinary that were elected in 1412 for the pursuit of the war. In 1432, the became members of the Venetian Senate.
They were five in number, and sat on the Full College (), the Republic's effective cabinet. As with other higher magistracies of Venice, restrictions were placed on the eligibility to the office: the members were elected from the Venetian Senate, served a term of six months, and could not be re-elected to the same office for three months thereafter. To ensure continuity, the appointments to the office of were staggered: three took office on 1 October, two on 1 January, three on 1 April, and two on 1 July.
Like all , the office did not carry a salary, but could be held in tandem with other public offices. The roles of each of the were eventually regularized: