Noun
The district under a Roman tetrarch; the office or jurisdiction of a tetrarch; a tetrarchate.
Source: Webster's dictionary3. Tetrarchy until 16 May 307 After the death of Constantius his legions proclamate his son Constantin to be the new Augustus, but Galerius elevates Severus to be the new junior Augustus and compensates Constantin with the grade of ''Caesar'. Source: Internet
5. Tetrarchy from May 311 After the death of Galerius he was succeeded by Maximinus Daia in the rank of an Augustus of the East, but is crowded by Licinius, who wants to have the status of the senior Augustus. Source: Internet
Bowman, "Diocletian and the First Tetrarchy" (CAH), 73; Millar, 180–81; Southern, 143; Williams, 52. Maximian made Augustus Maximian's campaigns were not proceeding as smoothly. Source: Internet
Bowman, "Diocletian and the First Tetrarchy" (CAH), 69; Odahl, 42–43; Southern, 136; Williams, 45. This argument has not been universally accepted. Source: Internet
Cascio, "The New State of Diocletian and Constantine" (CAH), 173. See also: Rees, Diocletian and the Tetrarchy, 18. Most taxes were due on each year on 1 September, and levied from individual landowners by decuriones (decurions). Source: Internet
Barnes, Constantine and Eusebius, 8–9; Williams, 67. This arrangement is called the tetrarchy, from a Greek term meaning "rulership by four". Source: Internet