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ALEXIUS I. emperor of the East, was the third son of John Comnenus, nephew of Isaac Comnenus, emperor 1057-10J9.
His father declined the throne on the abdication of Isaac, who was accordingly succeeded by four emperors of other families between that date and 1081.
Botaniates was forced to abdicate and retire to a monastery, and Isaac declined the crown in favour of his younger brother Alexius, who then became emperor in the 33rd year of his age.
Next, Alexius secured the alliance of the Cumans and with their help defeated (1091) the Pechenegs, who had beseiged Constantinople.
The last years of Alexius reign were consumed by fresh struggles with the Turks and by the intrigues of his daughter Anna Comnena against his son and heir, John II.
Alexius reign restored Byzantine military and naval power and political prestige, but brought onerous taxation, the depreciation of currency, and the extension of feudalism by grants of estates, draining imperial strength.