Octavius Sabinus was a governor of Britannia Inferior, a province of Roman Britain some time between c. AD 262 and 266.
An inscription at Lancaster mentions him in connection with repairs there. It indicates that he was of the senatorial rank rather than the third century norm of giving military commands such as this to officers of equestrian standing.
Epigraphic Evidence of Octavius Sabinus being Governor of Britannia Inferior
(Lancaster; RIB 601; dated:262 and 266 AD)
[ ̣ ̣ ̣] [ ̣ ̣ ̣ ̣ ̣] BALINEVM REFECT […] BASILICAM VETVSTATE CONLABSVM A SOLO RESTITVTAM EQ ALAE SEBVSSIAN ⟦[ ̣ ̣]Ṣ[ ̣]V[ ̣ ̣]Ạ͡ṆA͡E⟧ SVB OCTAVIO SABINO V C PRAESIDE N CVRANTE FLA AMMAV SIO PRAEF EQ DD XI KAL SEPTEM CENSORE II ET LEPIDO II COS
[For the Emperor … Postumus …] on account of the bath-house rebuilt and the basilica restored from ground-level, when fallen in through age, for the troopers of the Sebosian Cavalry Regiment, Postumus’ Own, under Octavius Sabinus, of senatorial rank, our governor, and under the charge of Flavius Ammausius, prefect of cavalry; dedicated on August 22nd in the consulship of Censor and Lepidus, both for the second time.
22 August of some year between a.d. 262 and 266 (incl.). This pair of consuls belonged to the Gallic Empire.