Answer
Ælfthryth, wife of King Edgar and stepmother to Edward, played a crucial role in supporting Æthelred against his half-brother Edward in their struggle for the English throne. She wielded considerable influence and acted as Æthelred's guardian and advisor during his early reign, shaping his policies and decisions. Her unwavering support proved instrumental in solidifying Æthelred's position as king, while Edward faced challenges consolidating his power.