Lausus was the son of the ousted Etruscan king Mezentius

Mezentius

In Roman mythology, Mezentius was an Etruscan king, and father of Lausus. Sent into exile because of his cruelty, he moved to Latium. He reveled in bloodshed and was overwhelmingly savage on the battlefield, but more significantly to a Roman audience he was a contemptor divum, a "despiser of the...

, and fought with him against Aeneas

Aeneas

Aeneas , in Greco-Roman mythology, was a Trojan hero, the son of the prince Anchises and the goddess Aphrodite. His father was the second cousin of King Priam of Troy, making Aeneas Priam's second cousin, once removed. The journey of Aeneas from Troy , which led to the founding a hamlet south of...

 and the Trojans

Troy

Troy was a city, both factual and legendary, located in northwest Anatolia in what is now Turkey, southeast of the Dardanelles and beside Mount Ida...

 in Italy. He appears in Virgil

Virgil

Publius Vergilius Maro, usually called Virgil or Vergil in English , was an ancient Roman poet of the Augustan period. He is known for three major works of Latin literature, the Eclogues , the Georgics, and the epic Aeneid...

's Aeneid

Aeneid

The Aeneid is a Latin epic poem, written by Virgil between 29 and 19 BC, that tells the legendary story of Aeneas, a Trojan who travelled to Italy, where he became the ancestor of the Romans. It is composed of roughly 10,000 lines in dactylic hexameter...

 in Books VII and X. When his father is wounded by Aeneas, Lausus steps in between them, and Aeneas strikes them down. In doing so, Lausus embodies the idea of pietas that Virgil praises throughout, exemplified in the relationships of Anchises and Aeneas and of Pallas and Evander. Aeneas immediately feels remorse for having killed the boy, and reproaches Lausus' men for keeping a distance rather than caring for the body: "Then to the stripling's tardy followers / he sternly called, and lifted from the earth / with his own hand the fallen foe: dark blood / defiled those princely tresses braided fair."

Lausus is considered a foil to Pallas

Pallas (son of Evander)

In Roman mythology, Pallas was the son of King Evander. In Virgil's Aeneid, Evander allows Pallas to fight against the Rutuli with Aeneas, who takes him and treats him like his own son Ascanius. In battle, Pallas proves he is a warrior, killing many Rutulians, and compared to the Rutulian Lausus,...

, the son of King Evander: both are young, come down from royal blood, are handsome, strong, full of filial piety, and both die at the hands of greater heroes.