Professional regiments, 10th–11th centuries
As the Byzantine Empire embarked on its campaigns of reconquest in the 10th century, the
tagmata became more active, and were posted often in garrison duties in the provinces or in newly conquered territories.
[27] In addition to the older units, a number of new and specialized units were formed to meet the demands of this more aggressive style of warfare.
[28] Michael II (r. 820–829) raised the short-lived
Tessarakontarioi, a special marine unit (named after their high pay of 40
nomismata),
[29] and
John I Tzimiskes (r. 969–976) created a heavy
cataphract corps called the
Athanatoi (Ἀθάνατοι, the "
Immortals") after the old
Persian unit, which were revived in the late 11th century by
Michael VII Doukas (r. 1071–1078). Other similar units were the
Stratēlatai, likewise formed by John Tzimiskes, the short-lived
Satrapai of the 970s, the
Megathymoi of the 1040s or the
Archontopoulai and
Vestiaritai of Alexios I.
[28] Many of the new
tagmata were composed of foreigners, such as the
Maniakalatai, formed by
George Maniakes from Franks in Italy,
[28] or the most famous of all tagmatic units, the 6,000-strong mercenary
Varangian Guard (Τάγμα τῶν Βαραγγίων), established ca. 988 by Emperor
Basil II (r. 976–1025).
The reign of Basil II also saw the beginnings of a profound transformation of the Byzantine military system. In the mid-10th century, the decline in the numbers of the thematic forces and the exigencies of the new offensive strategy on the eastern border gave rise to an increasing number of provincial
tagmata, permanent professional forces modelled after the imperial
tagmata.
[30]