Lucius Aurelius Verus (130–169) — son of Lucius Aelius Caesar; in 138, together with Marcus, adopted by Antoninus Pius (on Hadrian's condition). On Antoninus's death (161) Marcus made him co-emperor — the first formal joint principate in Roman history. He nominally led the Parthian War (161–166). He married Marcus's daughter Lucilla. He died suddenly in 169 (probably of the Antonine Plague) while returning with Marcus from the northern front.

• 01-17 — in the thanks to the gods: a "brother" whose character "could spur me to care for myself," and who at the same time gladdened him with respect and affection (per Capitolinus — despite his own dissoluteness he loved and honoured Marcus).
• 08-37 — "does Panthea or Pergamus still sit by the tomb of Verus?": Panthea was Lucius Verus's celebrated mistress; the passage is on the futility of mourning at tombs.