What type of details about richenza of northeim can be gathered from the following bio? Bio: richenza of northeim -lrb- c. 1087/1089 -- 10 june 1141 -rrb- , a member of the comital house of northeim , was duchess of saxony from 1106 , german queen -lrb- formally queen of the romans -rrb- from 1125 and holy roman empress from 1133 until the death of her husband lothair of supplinburg in 1137 .
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