(1) Magisterial or priestly: a board of officials. (2) Private: any private association of fixed membership and constitution (see clubs, roman).The principle of collegiality was a standard feature of republican magistracies at Rome. Although in some cases the common status of colleagues did not exclude seniority (originally one *consul may have been superior to the other and the consuls as a whole were senior colleagues of the *praetors), the principle in general was to avoid arbitrary power by ensuring that every magistracy should be filled by at least two officials, and in any case by an even number. They were to possess equal and co-ordinate authority, but subject to mutual control. Thus a decision taken by one consul was legal only if it did not incur the veto (*intercessio) of the other. This principle led to alternation in the exercise of power by the consuls each month. Under the Principate emperors might take as a colleague in their tribunician power (see tribuni plebis) their intended successors, who in many cases were co-emperors.
Pomerium—explained in antiquity as meaning what comes after, or before, the wall—was the line demarcating an augurally constituted city. It was a religious boundary, the point beyond which the auspicia urbana (see auspicium) could not be taken (Varro, Ling. 5. 143), and was distinct both from the city-wall and the limit of actual habitation, although it might coincide with the former and was often understood as the strip inside or outside the wall (cf. Livy 1. 44; Plut.Rom. 11). Almost every aspect of the history of the pomerium of Rome is debatable. Our sources refer to an original Palatine pomerium, later extended by Servius *Tullius and then unchanged until *Sulla’s day (sources in Lugli, Fontes 2. 125 ff.); Tacitus (Ann. 12. 24), perhaps following the emperor *Claudius, describes a circuit round the *Palatine. Although this circuit has been thought to result from confusion with the circuit of the *Lupercalia, recent excavations on the north-east slope of the Palatine have revealed a series of ditches and walls from the regal period, which seem from their size to be more of symbolic value than a real system of defence and thus perhaps confirm the literary tradition.
(1) The record-office at Rome (see archives (Roman)), possibly serving the adjacent *aerarium (treasury) of Saturn and built according to CIL 12. 737 by Q. *Lutatius Catulus(1) in 78 bce, but not mentioned in literary sources. It is traditionally associated with the trapezoidal building lying between the two summits of the *Capitol with its main front towards the Campus Martius. On the opposite side, closing the west end of the *forum Romanum, the elevation consisted of a massive substructure of ashlar masonry with an arcade of eleven arches flanked by Doric half-columns above it. A second storey of Corinthian columns, now disappeared, was probably added in Flavian times. A stairway from the Forum climbed through the ground floor of the substructure to the front hall of the building. The first floor contained a service corridor, leading from the top of the porticus Deorum Consentium to two floors of eastern strong-rooms.