Please answer the following question: What type of details about john doukas -lrb- sebastokrator -rrb- can be gathered from the following bio? Bio: john doukas , latinized as ducas , -lrb- , '' ioannes doukas '' ; ca. 1125/1127 -- ca. 1200 -rrb- was the eldest son of constantine angelos by theodora komnene , the seventh child of the byzantine emperor alexios i komnenos and irene doukaina , from whose family name john doukas took his own . he served as a military commander under manuel i komnenos and his nephew isaac ii angelos , who raised him to the high rank of '' sebastokrator '' . despite his advanced age , he continued to be an active general in the 1180s and 1190s , and until shortly before his death aspired to the imperial throne . he was the progenitor of the komnenos doukas line , which founded the despotate of epirus after the fourth crusade .
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