The Justice of Trajan is a legendary episode in the life of Roman Emperor Trajan, based upon Dio Cassius' account (Epitome of Book LXVIII, chapter 10): "He did not, however, as might have been expected of a warlike man, pay any less attention to the civil administration nor did he dispense justice any the less; on the contrary, he conducted trials, now in the Forum of Augustus, now in the Portico of Livia, as it was called, and often elsewhere on a tribunal."
According to the story, Trajan, busy with preparations for the Dacian Wars, was petitioned for justice by the mother of a murdered man. He asked her to wait until he returned, but she pointed out that he might not return at all. He made time to settle her case despite all the other calls on his time. The legend, though indirectly, was popularized by Dante in The Divine Comedy, alluded to in the Paradise, and recounted in Purgatory, X, 73-94:
"Grant vengeance, sire! for, woe beshrew this heart
My son is murder'd." He replying seem'd;
"Wait now till I return." And she, as one
Made hasty by her grief; "O sire, if thou
Dost not return?"—"Where I am, who then is,
May right thee."—"What to thee is other's good,
If thou neglect thy own?"—"Now comfort thee,"
At length he answers. "It beseemeth well
My duty be perform'd, ere I move hence:
So justice wills; and pity bids me stay.
The origin of the legend and its vicissitudes since antiquity have been the subject of several studies, including detailed "Leggende" by G. Boni, published in 1906. The episode was reflected in several works of art and in the verse The Justice by Belarusian poet Simeon of Polotsk (1629—1680). Among artists that depicted the legend are Eugène Delacroix, Rogier van der Weyden, Hans Sebald Beham, Noël Coypel and Noël Hallé. A French painter Raoul Dufy was inspired by Delacroix's painting of the justice.