Rienzi vowing to obtain justice for the death of his young brother, slain in a skirmish between the Colonna and the Orsini factions

Rienzi vowing to obtain justice for the death of his young brother, slain in a skirmish between the Colonna and the Orsini factions (or simply, Rienzi) is an oil-on-canvas painting by the English artist William Holman Hunt, produced in 1849 and currently in a private collection.

History
This painting, with its extremely long title, was the first of Hunt's works to include 'PRB' (Pre-Raphaelite Brotherhood) on the canvas.

Hunt took his subject from the 1835 novel Rienzi, the Last of the Roman Tribunes, by Bulwer Lytton, about Cola di Rienzi (1313–1354), a papal notary who led a popular uprising in Rome. It was exhibited at the 1849 Royal Academy exhibition (alongside Millais' Lorenzo and Isabella) with the following excerpt from the novel, describing the hero's reaction to the incident:

In 1847, Hunt repeatedly sat up all night to finish John Ruskin's Modern Painters (1843); in Rienzi he attempted to put into practice all that he had read. The background particularly was painted in careful detail trying to satisfy Ruskin's stringent requirements. As can be seen from some of Hunt's later work, such as The Hireling Shepherd (1851) and The Awakening Conscience (1854), the artist often experienced great difficulty with painting his figures in natural poses. This is evident here in the portrayal of the soldier on the far left of the painting.