As Trajan gained great popularity in the early years of his reign by an abolition of the arrears of certain debts due to the imperial treasury, amounting to a large sum, and as he also established alimenta, these reliefs have been generally supposed to commemorate his public benefactions, in founding relief institutions and cancelling public debts. The backgrounds of both the sculptures are occupied by representations of some public buildings, but it does not seem possible to identify these with any certainty. That they roughly represent some of the temples and Basilicas in the Forum in a sketch is all we can say. One of the temples shown in the relief which depicts the foundation of alimenta has only five columns in its portico, showing a want of accuracy in the drawing which throws great doubt upon its topographical value. The archæologists who have endeavoured to name the buildings have agreed in calling the Ionic and the Corinthian portico in the relief where the account books are being burnt those of the Temples of Saturn and Vespasian, with an arch of the tabularium between them, and the long row of arches the Basilica Julia, but they differ as to the buildings shown in the other relief, for while Mr. Nichols thinks that the Basilica Julia is here again represented with the Heroon of Julius Cæsar and the arch of Augustus, Signor Brizio is of opinion that we have here the north-western side of the Forum with the Basilica Æmilia.[50] The rostra are probably meant to represent temporary wooden constructions. The most reasonable conjecture which has yet been made as to the purpose which these sculptured screens served is that they formed a pons or passage along which voters passed at a time of election from the Forum to the office where the votes were taken. A great part of the structures used at such times was probably temporary, and made of wood for the occasion. Another explanation suggested by Mr. Nichols is that they formed a passage leading to an altar and statue of the Emperor. It may be that the sculptures never reached their destined site, but were left here, as many of the marbles on the Tiber banks were, and gradually buried in rubbish. [Sidenote: Basilica Julia.] We now pass to the rows of restored bases of columns, which occupy the long space on the south-western side of the seven pedestals above mentioned. Here we find the ground plan of the great Basilica Julia marked out by a treble row of columns at each of the larger sides, and a double row at each end. One pier of the outer row towards the Forum has been restored by Rosa so as to show the original height. The proof that these ruins belong to the Basilica Julia which was planned by Julius Cæsar, and begun by him but completed by Augustus, who dedicated it to his grandsons Caius and Lucius, is the statement in the monumentum Ancyranum, in which it is placed between the temples of Saturn and Castor.