Wikipedia
thumb|upright 1.2| Aeneas' fight against Mezentius and Lausus, by Wenceslaus Hollar. Lausus was the son of the ousted Etruscan king Mezentius, and fought with him against Aeneas and the Trojans in Italy. He appears in Virgil's Aeneid 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, 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.
Lausus or Lausos (c. 400 AD. - c. 450 AD) was a eunuch of the court of Theodosius II, famous for acquiring a palace and a large collection of art and sculptures. He also served as imperial chamberlain ( praepositus sacri cubiculi) between 420 and 422 AD. One of the oldest historical accounts of the Christian Church, the Historia Lausiaca, was dedicated to him.
The Palace of Lausus, destroyed in a fire in 475, was supplied by the now-preserved Binbirdirek Cistern in Istanbul.