Following the death of Antoninus Pius in AD 161, the Roman Empire acquired two emperors who ruled jointly: Marcus Aurelius and Caesar Lucius Aurelius Verus Augustus, better known as Lucius Verus. Both men were adopted sons of Antoninus Pius. Lucius Verus died of the plague in 169, after which Marcus Aurelius ruled alone until his own death in 180.
There are several coins of Lucius Verus available for sale and collectors should keep an eye on the current selection, which changes often.