Explore the Symbolic theme of this artwork.
The painting depicts the Roman Horatius family, who, according to Titus Livius' Ab Urbe Condita (From the Founding of the City) had been chosen for a ritual duel against three members of the Curiatii, a family from Alba Longa, in order to settle disputes between the Romans and the latter city. 
As revolution in France loomed, paintings urging loyalty to the state rather than to clan or clergy abounded. Although it was painted nearly four years before the revolution in France, The Oath of the Horatii became one of the defining images of the time. In the painting, the three brothers express their loyalty and solidarity with Rome before battle, wholly supported by their father. These are men willing to lay down their lives out of patriotic duty. With their resolute gaze and taut, outstretched limbs, they are citadels of patriotism. They are symbols of the highest virtues of Rome. Their clarity of purpose, mirrored by David's simple yet powerful use of tonal contrasts, lends the painting, and its message about the nobility of patriotic sacrifice, an electric intensity. This is all in contrast to the tender-hearted women who lie weeping and mourning, awaiting the results of the fighting.The mother and sisters are shown clothed in silken garments seemingly melting into tender expressions of sorrow. Their despair is partly because one sister was engaged to one of the Curiatii and another is a sister of the Curiatii, married to one of the Horatii. Upon the defeat of the Curiatii, the remaining Horatius journeyed home to find his sister cursing Rome over the death of her fiancé. He killed her, horrified that Rome was being cursed. Originally David had intended to depict this episode, and a drawing survives showing the surviving Horatius raising his sword, with his sister lying dead. David later decided that this subject was too gruesome a way of sending the message of public duty overcoming private feeling, but his next major painting, The Lictors Bring to Brutus the Bodies of His Sons depicted a similar scene - Lucius Junius Brutus brooding as the bodies of his sons, whose executions for treason he had ordered, are returned home.  This was a subject the tragedy Brutus by Voltaire had made familiar to the French. The painting shows the three brothers on the left, the Horatii father in the center, and the three women along with two children on the right.  The Horatii brothers are depicted swearing upon (saluting) their swords as they take their oath. The men show no sense of emotion. Even the father, who holds up three swords, shows no emotion. On the right, three women are weeping—one in the back and two up closer. The woman dressed in the white is a Horatius weeping for both her Curiatii fiancé and her brother; the one dressed in brown is a Curiatius who weeps for her Horatii husband and her brother. The background woman in black holds two children—one of whom is the child of a Horatius male and his Curiatii wife. The younger daughter hides her face in her nanny's dress as the son refuses to have his eyes shielded.
According to Thomas Le Claire:This painting occupies an extremely important place in the body of David’s work and in the history of French painting. The story was taken from Livy. We are in the period of the wars between Rome and Alba, in 669 B.C. It has been decided that the dispute between the two cities must be settled by an unusual form of combat to be fought by two groups of three champions each. The two groups are the three Horatii brothers and the three Curiatii brothers. The drama lay in the fact that one of the sisters of the Curiatii, Sabina, is married to one of the Horatii, while one of the sisters of the Horatii, Camilla, is betrothed to one of the Curiatii. Despite the ties between the two families, the Horatii's father exhorts his sons to fight the Curiatii and they obey, despite the lamentations of the women.
Lucius Junius Brutus right revolution in France Livy Rome Titus Livius Horatius left The Lictors Bring to Brutus the Bodies of His Sons Alba Longa Voltaire Ab Urbe Condita Horatii