Leo I, King of Armenia dating history

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Leo was a valiant and learned prince; he enlarged his principality and became the master of many provinces. A few days only after his taking possession of the country, the descendants of Ismael, under the command of one Roustam, advanced and came against Cilicia. Leo was not frightened, but confiding in God, who destroyed Sanacherib, he vanquished with a few men the great army of the infidels. Roustam himself was killed by St. George, the whole Hagarenian army then fled and dispersed; the Armenians pursued them and enriched themselves with the treasure. The power of Leo thus increased, and being confident in his strength, he chased the Tadjiks [name used by Armenian chroniclers to designate the Saracens, particularly the Seljuks] and pursued the Turks; he conquered Isauria and came as far as Iconium; he captured Heraclea, and again gave it up for a large ransom; he blockaded Caesarea, and had nearly taken it; he made a treaty with the Sultan of Iconium, and received a large sum of money from him; he surrounded Cilicia on every side with forts and castles; he built a new church called Agner, and was exceedingly generous to all monasteries erected by his ancestors; his bounty extended itself even to the leprous; they being shunned by everybody and expelled from every place, he assigned to them a particular house, and provided them with necessaries.