In the useless altercations that precede and justify the quarrels of princes, the Greeks and the barbarians accused each other of violating the peace which had been concluded between the two empires about four years before the death of Justinian. The sovereign of Persia and India aspired to reduce under his obedience the province of Yemen or Arabia Felix--the distant land of myrrh and frankincense, which had escaped, rather than opposed, the conquerors of the East. After the defeat of Abrahah under the walls of Mecca, the discord of his sons and brothers gave an easy entrance to the Persians; they chased the strangers of Abyssinia beyond the Red Sea, and a native prince of the ancient Homerites was restored to the throne as the vassal or viceroy of the great Nushirvan. But the nephew of Justinian declared his resolution to avenge the injuries of his Christian ally the prince of Abyssinia, as they suggested a decent pretence to discontinue the annual tribute, which was poorly disguised by the name of pension. The churches of Pers-Armenia were oppressed by the intolerant spirit of the magi; they secretly invoked the protector of the Christians, and after the pious murder of their satraps, the rebels were avowed and supported as the brethren and subjects of the Roman emperor. The complaints of Nushirvan were disregarded by the Byzantine court; Justin yielded to the importunities of the Turks, who offered an alliance against the common enemy; and the Persian monarchy was threatened at the same instant by the united forces of Europe, of Ethiopia, and of Scythia. At the age of fourscore, the sovereign of the East would perhaps have chosen the peaceful enjoyment of his glory and greatness; but as soon as war became inevitable, he took the field with the alacrity of youth, whilst the aggressor trembled in the palace of Constantinople. Nushirvan, or Chosroes, conducted in person the siege of Dara; and although that important fortress had been left destitute of troops and magazines, the valour of the inhabitants resisted above five months the archers, the elephants, and the military engines of the Great King. [Sidenote: [576-589 A.D.]]