It sounds like you are referring to Marcus Aurelius and Lucius Verus, who indeed were co-emperors and got along well. This inscription does not refer to them. It refers to Septimius Severus and his two sons, Caracalla (referred to here as "Marcus Aurelius Antoninus Pius Felix Augustus") and his brother Geta (Publius Septimius Geta). They got along rather less well than Marcus Aurelius and Lucius Verus :-).
veluna t1_it0g7cb wrote
Reply to comment by taint-juice in One of the longest ancient Roman inscriptions ever discovered in Britain is to go on display for the first time. by Demderdemden
It sounds like you are referring to Marcus Aurelius and Lucius Verus, who indeed were co-emperors and got along well. This inscription does not refer to them. It refers to Septimius Severus and his two sons, Caracalla (referred to here as "Marcus Aurelius Antoninus Pius Felix Augustus") and his brother Geta (Publius Septimius Geta). They got along rather less well than Marcus Aurelius and Lucius Verus :-).