Bohemia and Moravia was included within the sphere of Roman power; and, as was already observed, this was not without its influence on the stationing of the Roman frontier-guard. [Sidenote: Jazyges.] In the plain between the Danube and Theiss eastward from the Roman Pannonia, and between this and the Thracian Daci, there was inserted a section of the people--probably belonging to the Medo-Persian stock--the Sarmatae, who living nomadically as a nation of shepherds and horsemen filled in great part the wide east-European plain; these were the Jazyges, named the "emigrants" (μετανάσται) in distinction from the chief stock which remained behind on the Black Sea. The designation shows that they only advanced at a comparatively late period into these regions; perhaps their immigration falls to be included among the assaults, under which about the time of the battle of Actium the Dacian kingdom of Burebista broke down (p. 11). They meet us here at first under the emperor Claudius; the Jazyges supplied the Suebian king Vannius with the cavalry for his wars. The Roman government was on its guard against the alert and predatory bands of horsemen, but did not otherwise sustain hostile relations to them. When the legions of the Danube marched to Italy in the year 70 to place Vespasian on the throne, they declined the contingent of cavalry offered by the Jazyges, and in fitter fashion carried with them only a number of the men of chief rank, in order that these should meanwhile be pledges for quiet on the denuded frontier. [Sidenote: Daci.]