Part 3: KOMNENIAN BYZANTINE ARMY: Structure
- Command hierarchy and unit composition
Under the emperor, the commander-in-chief of the army was the megas domestikos (Grand Domestic). His second-in-command was the protostrator. The commander of the navy was the megas doux (Grand Duke), who was also the military commander for Crete, the Aegean Islands and the southern parts of mainland Greece. A commander entrusted with an independent field force or one of the major divisions of a large expeditionary army was termed a strategos (general).
Individual provinces and the defensive forces they contained were governed by a doux (duke) or katepano (though this title was sometimes bestowed on the senior administrator below the doux), who was a military officer with civil authority; under the doux a fortified settlement or a fortress was commanded by an officer with the title kastrophylax (castle-warden). Lesser commanders, with the exception of some archaic titles, were known by the size of the unit they commanded, for example a tagmatarches commanded a tagma (regiment). The commander of the Varangians had a unique title, akolouthos (acolyte), indicating his close personal attendance on the emperor.
During the Komnenian period the earlier names for the basic units of the Byzantine cavalry, bandon and moira, gradually disappear to be replaced by the allagion, believed to have been between 300 and 500 men strong. The allagion, commanded by an allagator, was probably divided into subunits of 100, 50 and 10 men. On campaign the allagia could be grouped together (usually in threes) into larger bodies called taxeis, syntaxeis, lochoi or tagmata. The infantry unit was the taxiarchia, a unit type first recorded under Nikephoros II Phokas; it was theoretically 1000 men strong, and was commanded by a taxiarches.
- Guards units and the Imperial household
Many of the earlier guard units did not survive the reign of Alexios I: the scholai, Immortals (athanatoi), and exkoubitoi are not mentioned in the reigns of his immediate successors. The notable exceptions to this process being the Varangians and vestiaritai, and probably the archontopouloi. The hetaireia (literally "companions"), commanded by the megas hetaireiarches, is still mentioned, though it was always more a collection of individual units under an administrative title than a regiment as such. In this period, the Varangian Guard consisted of Englishmen, Russians, and Scandinavians, totalling 5,000 men.
Immediately after the Battle of Dyrrhachium, Alexios I recruited 2,000 men to form the tagma of the archontopouloi. The Vardariots, a cavalry unit initially recruited from the Christianized Magyars of the Vardar valley, were a later addition to the guard and were probably raised by John II. They were commanded by an officer with the rank of primmikerios. Of increasing importance during the family-centric Komnenian period were the men known as oikeioi (olkelol, "those of the household"); when mobilized for war the oikeioi were the equivalent of the household knights of western kings and would have served as kataphraktoi. These household troops would have included the emperor's personal retinue, his relatives and close associates, also accompanied by their immediate retinues, and the young aristocrats attached to the court; plus they probably also included the vestiaritai guards.
The oikeioi would have been equipped with the finest arms and armour and mounted on the highest quality war-horses available. Although not an entirely formal regiment the "household" (oikos) would have been a formidable fighting force, however, it would have been available only when the emperor took the field in person. Officers of the vestiaritai were given the lofty court title of sebastos and two of their number, Andronikos Lampardas and Alexios Petraliphas, were prominent generals. Under Alexios I, and probably subsequently, the imperial oikos also served as a sort of "staff college" for training promising young officers. Alexios took 300 young officers into his household, whom he trained personally. In the campaign against Bohemund in 1107-1108, the best of these officers commanded the blockading forces keeping the Norman army pent up on the Albanian coast. The victorious outcome of this campaign probably resulted, in part, from the increased discipline the Byzantine forces showed due to the quality of their commanders.
Though Georgian and from the 11th century an icon of St. George shows the armour most often depicted on Byzantine heavy cavalrymen of the Komnenian period. Despite being superficially "Classical" in appearance the armour is in fact contemporary: a lamellar klivanion cuirass with tubular splint defences for the upper arms and the kremasmata, a splinted 'skirt,' to protect the hips and thighs; the boots are of a typical knee-length Byzantine type employed by cavalry.
- Native regiments
In the course of the 11th century the units of part-time soldier-farmers belonging to the themata (military provinces) were largely replaced by smaller, full-time, provincial tagmata (regiments). The political and military anarchy of the later 11th century meant that it was solely the provincial tagmata of the southern Balkans which survived. These regiments, whose soldiers could be characterized as "native mercenaries," became an integral part of the central army and many field armies of the Komnenian period, the tagmata of Macedonia, Thrace and Thessaly being particularly notable. Though raised in particular provinces these regiments had long ceased to have any local defence role. As regions were reconquered and brought under greater control provincial forces were re-established, though initially they often only served to provide local garrisons. In the reign of Manuel I the historian Niketas Choniates mentions a division of a field army composed of "the eastern and western tagmata." This wording implies that regular regiments were once again being raised in Anatolia. Military settlers, often derived from defeated foes, also supplied soldiers; one such group of settlers, defeated Pechenegs, was settled in the Moglena district and provided a unit to the army; another was composed of Serbs who were settled around Nicomedia in Anatolia. Towards the end of the period pronoia revenue grants, from the income generated by parcels of land, allowed the provinces to be used to raise heavy cavalrymen with less immediate drain on the state treasury. The origins and organisation of the native infantry of the Byzantine army of this period are obscure. It is known that there was an official register of soldiers serving as infantry, but their geographical origins and unit names are not recorded. As the native cavalry were organised into regional units it is probable that the infantry had a similar organisation. It is possible that each native provincial tagma, such as that described in the sources as the "Macedonian Legion" or "Macedonian Division," included an infantry taxiarchia, or possibly more than one, alongside the better attested contingents of kataphraktos heavy cavalry.
- Foreign regiments and allied contingents
The central army (basilika allagia or taxeis), in addition to the guards units and the native regiments raised from particular provinces, comprised a number of tagmata of foreign soldiers. These included the latinikon, a heavy cavalry formation of Western European 'knights,' and members of families of western origin who had been in Byzantine employ for generations. It has been suggested that to regard these knights as mercenaries is somewhat mistaken and that they were essentially regular soldiers paid directly from the state treasury, but having foreign origins or ancestry. Another unit was the tourkopouloi ("sons of Turks"), which, as its name implies, was composed of Byzantinised Turks and mercenaries recruited from the Seljuk realms. A third was the skythikon recruited from the Turkic Pechenegs, Cumans and Uzes of the Ukrainian Steppes.
In order to increase the size of his army, Alexios I even recruited 3,000 Paulicians from Philippopolis and formed them into the "Tagma of the Manichaeans", while 7,000 Turks were also hired. Foreign mercenaries and the soldiers provided by imperial vassals (such as the Serbs and Antiochenes), serving under their own leaders, were another feature of the Byzantine army of the time. These troops would usually be placed under a Byzantine general as part of his command, to be brigaded with other troops of a similar fighting capability, or combined to create field forces of mixed type. However, if the foreign contingent were particularly large and its leader a powerful and prominent figure then it might remain separate; Baldwin of Antioch commanded a major division, composed of Westerners (Antiochenes, Hungarians and other 'Latins'), of the Byzantine army at the Battle of Myriokephalon. The Byzantines usually took care to mix ethnic groups within the formations making up a field army in order to minimize the risk of all the soldiers of a particular nationality changing sides or decamping to the rear during battle. During the early part of the 12th century, the Serbs were required to send 300 cavalry whenever the Byzantine emperor was campaigning in Asia Minor. This number was increased after Manuel I defeated the Serb rebellion in 1150 to 2,000 Serbs for European campaigns and 500 Serbs for Anatolian campaigns. Towards the end of the Komnenian period Alan soldiers, undoubtedly cavalry, became an important element in Byzantine armies.
- Armed followers of the aristocracy
The semi-feudal forces raised by the dynatoi or provincial magnates were a useful addition to the Byzantine army, and during the middle years of the reign of Alexios I probably made up the greater proportion of many field armies. Some leading provincial families became very powerful; for example, the Gabras family of Trebizond achieved virtual independence of central authority at times during the 12th century. The wealthy and influential members of the regional aristocracy could raise substantial numbers of troops from their retainers, relatives and tenants. Their quality, however, would tend to be inferior to the professional troops of the basilika allagia. The "personal guards" of aristocrats who were also generals in the Byzantine army are also notable in this period. These guards would have resembled smaller versions of the imperial oikos. The sebastokrator Isaac, brother of John II, even maintained his own unit of vestiaritai guards. The guard of the megas domestikos John Axouch was large enough to put down an outbreak of rioting between Byzantine troops and allied Venetians during the siege of Corfu in 1149. Such units would have been composed of well-equipped, effective soldiers and would often have included kinsmen of the general.