Map of the Roman empire in AD 125, under emperor Hadrian, showing the Legio X Gemina, stationed on the river Danube at Vindobona (Vienna, Austria), in Pannonia Superior province, from AD 103 until the 5th century
Equestris, "Of the knights" under Caesar Gemina, "The twin" (since 31 BC) Pia Fidelis, "faithful and loyal" (since 89) Domitiana, Antoniniana, Gordiana, Deciana, Floriana, Cariniana (short-lived) Pia VI Fidelis VI (after 260)
In the Latin language, "gemina" can refer to either "female twin" or "neuter twins." Male twin (referring to one twin in a set of twins) would be written as "geminus", and Male twins (referring to both member of a set of twins) would be written as "gemini."
In the Gallic Wars, X Equestris played an important role on Caesar's military success and for this reason is sometimes said to be his favorite. In Caesar's campaigns they were present in the battle of the Sabis, the invasions of Britain, and the battle of Gergovia. They remained faithful to Caesar in the civil war against Pompey, being present in the battles of Pharsalus (49 BC) and Munda (45 BC). In 45 BC Caesar disbanded the legion, giving the veterans farmlands near Narbonne in Gaul and in Hispania.
Augustus
The legion was reconstituted in 42 BC and fought for Augustus (commonly referred to by Octavian by historians), Lepidus and Mark Antony in the Battle of Philippi against the murderers of Caesar. After this, they followed Mark Antony in his campaign against Parthia and were defeated with him at Actium. Augustus then took control of the legion and settled the veterans in Patras. The legion rebelled and lost its cognomenEquestris as punishment. Replacements were added from other legions, and the Tenth was rebaptized Gemina.
The legion was sent to Carnuntum in Pannonia in about 63 AD (or a bit earlier) after legio XV Apollinaris left and went to the east.[1] During the brief reign of Galba (68-69), it was transferred back to Hispania.
Under the Flavian dynasty
However, its stay in Hispania was to be very brief. In 70, after the Batavian rebellion was suppressed by the new emperor Vespasian, X Gemina was sent to Batavia in Germania Inferior to police the lands and prevent new revolts. From 71 to 103, the legion was stationed at the base built by II Adiutrix near Oppidum Batavorum, the present day Dutch city of Nijmegen.
During Trajan's first campaign in Dacia (101–102), the legion participated at the Second Battle of Tapae, fighting against the army of the Dacians led by King Decebalus.
X Gemina supported its governor, Septimius Severus, in his bid for purple, and many men of the legion went to Rome to become part of the Praetorian Guard of the new Emperor.
3rd century
During the 3rd century, the legion fought for several emperors, who awarded the legion with titles showing the fidelity of the legion and the favour gained by the Emperor himself. The titles Antoniniana (awarded by Caracalla or Elagabalus), Gordiana (by Gordian III), Deciana (by Decius), Floriana (by Florianus), and Cariniana (by Carinus) were short-lived, however, and dropped after the death of the Emperor. For its support of Emperor Gallienus against Postumus, the Gemina was awarded the title Pia VI Fidelis VI, "six times faithful, six times loyal".
- Lucius LaviusLuci filius Aemilia tri(bu)Tuscus Felicitis Iulia miles legionis X Geminae Victricis- Porto (Portus), Portugal. AE 1953, 268.
- sacrum Caius Valerius Carus miles legionis X Geminae votum solvit libens merito. Lugo (Lucus Augusti), Spain. Hisp. Epi. 19118.
- Caius Iulius Sergia Hispali (f) Victor miles legionis X Gemina (centuria Fabi Celtiberi annorum XLII aerum / XVIII hic (...). Pontevedra, Spain. CIL II 2545.
- Iovi Augusto Ultori sacrum Lucius Valerius Paternus miles legionis X Geminae optio centuria Censoris exs (...). Pontevedra, Spain. AE 1908, 147.
- Gaius Iulius Primus miles veteranuslegionis X Geminae / hic situs estsit tibi terra levis. Jaen, Andalucía, Spain. CIL II2/5, 5.
- Dis Manibus Gaio Urbanio Firminomiliti legionis X / Iulius Ingenuus miles legionis. Jaen, Andalucía, Spain. CIL II 1691
- Capito Sunnae filius decurio equitum alae geminae legionis X Rustica Galli filia. Sevilla (Hispalis), Spain.CIL II2/5, 1136.
- Publius Talius Quinti filius Papiria (tribu) legionis X hic situs est sit tibi terra (...). Beja (Pax Iulia), Portugal. Hisp. Epi. 23031.
- Marcus Aurelius Marci filius Galeria (tribu) Abbicus miles legionis X decimae. Beja (Pax Iulia), Portugal. AE 1980, 562.
- Lucius Octavius Luci filius Pupinia (tribu) Baeterensis Magiusannorum XXXVII / aerorum XIX tubicen / mileslegionis X Geminae(...). Astorga (Asturica), Spain. AE 1928, 163.
- Caius Pelgus Luci filius Scaptia (tribu) Clemens veteranus legionis) X Geminae vixit annos LVI hic situs est/ Caius Pelgus (...). Astorga (Asturica), Spain. CIL II 5076 = CIL II 5662 = AE 1904, 160.
- Caius Coelius Cai filius Papiria (tribu) Valens Narniense miles legionis X Geminaecenturia Castellani annorum XXXV aerorum XIII (...). Astorga (Asturica), Spain. IRPLe 79.
- Marcus Persius Marci filius Pollia (tribu) Blaesus domo Hasta miles legionis X Geminae centuria (...). Astorga (Asturica), Spain. AE 1904, 160.
- Lucius Herennius Luci filius) Galeria (tribu) Callicus domo Ugia miles legionis X Geminae / centuria Licini Clementis annorum / (...). Zamora, Spain. CIL II 5076 = CIL II 5662 = AE 1904, 180.
- Publius Cosconius Publi filius / Galeria Arsensis / miles legionis X Geminaecenturia Etrili annorum XXXI aerorum XI / hic situs (...). Zamora, Spain. AE 1928, 179.
- Marcus Cornelius Marci filius Aniensi Foro Iulii miles legionis X Geminaecenturiae Terebrae annorum XXII aerorum (...). Zamora, Spain. Hisp. Epi. 15846.
- Rufus miles legionis X Geminae fecit. Zamora, Spain. AE 1997, 867.
- Marcus Volumnius Cai filius Aniensi / Cremona miles legionis X hic situs est. Zamora, Spain. CIL II 2631.
- Dis Manibus Tito Cassio Flavino centurioni legionis X Geminae Chrysampelus patrono optimo pecunia sua fecit. Tarragona (Tarraco), Spain. CIL II 4152.
- Severus Marci filius (...) miles legionis X Geminae centuriae (...). Burgos, Spain. Hisp. epi. 16472.
^§185 Marcus Titius Lustricus Bruttianus, Database of Military Inscriptions and Papyri of Early Roman Palestine, text, translation, and bibliography (last accessed 18 January 2019)
^Géza Alföldy, Konsulat und Senatorenstand unter der Antoninen (Bonn: Rudolf Habelt Verlag, 1977), p. 300
^Paul M. M. Leunissen, Konsuln und Konsulare in der Zeit von Commodus bis Severus Alexander (Amsterdam: J.C. Gieben, 1989), p. 342
^Anthony Birley, The Fasti of Roman Britain (Oxford: Clarendon Press, 1981), p. 10