Sirianus was the Byzantine catapan of Italy, the second appointed by the Emperor Constantine X Doukas.
He arrived in Bari, the seat of the catapanate, in 1061 or 1062, replacing Marules, who had been appointed the previous year.
[1] According to the annals of Lupus Protospatharius, the Norman duke Robert Guiscard captured Oria and Brindisi in the year of his appointment and Taranto in the following year.
[3][4] The name Sirianus is a Latinization of the Italianized form Siriano found in the chronicle.
It is uncertain whether it represents the Byzantine Greek name Syrianos (Συριανός) or Syrgiannes (Συργιάννης).