Marcus Iallius or Jallius Bassus was a Roman senator, general, and literary figure who held several offices in the imperial service during the mid-second century AD.
Bassus was from Alba Helviorum (modern Joyeuse, Ardèche), where two inscriptions record his cursus honorum.
[4] Bassus' senatorial career began with his adlection inter tribunicios, that is as having held the office of plebeian tribune.
First Bassus held the post of curator operum locorumque publicorum et aedium sacrum, which Alföldy dates to the year 161.
Upon the resolution of that conflict, Bassus was appointed governor of Pannonia Superior; Alföldy dates his tenure in that province from around 166 to 169.