The selection was done "invitis omnibus", "against the wishes of everyone"; in particular, Servianus and the young Salinator became very angry at Hadrian and wished to challenge him over the adoption. Even today, the rationale for Hadrian's sudden switch is still unclear. It is possible Salinator went so far as to attempt a coup against Hadrian in which Servianus was implicated. In order to avoid any potential conflict in the succession, Hadrian ordered the deaths of Salinator and Servianus. Although Lucius had no military experience, he had served as a senator, and had powerful political connections; however, he was in poor health. As part of his adoption, Lucius Ceionius Commodus took the name Lucius Aelius Caesar. After a year's stationing on the Danube frontier, Aelius returned to Rome to make an address to the senate on the first day of 138. The night before the speech, however, he grew ill, and died of a haemorrhage late the next day. On 24 January 138, Hadrian selected Aurelius Antoninus (September 19, 86 – March 7, 161) as his new successor. After a few days' consideration, Antoninus accepted. He was adopted on 25 February. As part of Hadrian's terms, Antoninus adopted both Lucius Aelius's son (properly called Lucius Ceionius Commodus the Younger) and Hadrian's great-nephew by marriage, Marcus Aurelius (April 26, 121 – March 17, 180). Marcus became M. Aelius Aurelius Verus; Lucius became L. Aelius Aurelius Commodus. At Hadrian's request, Antoninus' daughter Faustina was betrothed to Lucius. Marcus Aurelius later co-ruled with Lucius Verus as joint Roman Emperors, until Lucius Verus died in 169, after which Aurelius was sole ruler until his own death in 180. The major sources for the life of Aelius are patchy and frequently unreliable. The most important group of sources, the biographies contained in the "Historia Augusta", claim to be written by a group of authors at the turn of the 4th century, but are in fact written by a single author (referred to here as "the biographer") from the later 4th century (c. 395). The later biographies and the biographies of subordinate emperors and usurpers are a tissue of lies and fiction, but the earlier biographies, derived primarily from now-lost earlier sources (Marius Maximus or Ignotus), are much more accurate.