Question: Who did the woman disposed as regent by the King of Mercia married to?

<P0-S0> Ælfflæd (fl. <P0-S1>  840), was the daughter of Ceolwulf I of Mercia, and later married Wigmund of Mercia. <P0-S2>  Their son, Wigstan of Mercia, inherited the throne in 840 but, declining the kingship, appointed his mother as regent. <P0-S3>  She was deposed from this position by Beorhtwulf of Mercia. <P0-S4>  Ælfflæd should not be confused with her earlier Mercian namesake, Ælfflæd, the daughter of Offa of Mercia. <SEP> <P1-S0> Beorhtwulf (] , meaning "bright wolf"; also spelled "Berhtwulf"; died 852) was King of Mercia, a kingdom of Anglo-Saxon England, from 839 or 840 to 852. <P1-S1>  His ancestry is unknown, though he may have been connected to Beornwulf, who ruled Mercia in the 820s. <P1-S2>  Almost no coins were issued by Beorhtwulf's predecessor, Wiglaf, but a Mercian coinage was restarted by Beorhtwulf early in his reign, initially with strong similarities to the coins of Æthelwulf of Wessex, and later with independent designs. <P1-S3>  The Vikings attacked within a year or two of Beorhtwulf's accession: the province of Lindsey was raided in 841, and London, a key centre of Mercian commerce, was attacked the following year. <P1-S4>  Another Viking assault on London in 851 "put Beorhtwulf to flight", according to the "Anglo-Saxon Chronicle"; the Vikings were subsequently defeated by Æthelwulf. <P1-S5>  This raid may have had a significant economic impact on Mercia, as London coinage is much reduced after 851. <SEP> <P2-S0> Wulfhere or Wulfar (died 675) was King of Mercia from 658 until 675 AD. <P2-S1>  He was the first Christian king of all of Mercia, though it is not known when or how he converted from Anglo-Saxon paganism. <P2-S2>  His accession marked the end of Oswiu of Northumbria's overlordship of southern England, and Wulfhere extended his influence over much of that region. <P2-S3>  His campaigns against the West Saxons led to Mercian control of much of the Thames valley. <P2-S4>  He conquered the Isle of Wight and the Meon valley and gave them to King Æthelwealh of the South Saxons. <P2-S5>  He also had influence in Surrey, Essex, and Kent. <P2-S6>  He married Eormenhild, the daughter of King Eorcenberht of Kent. <SEP> <P3-S0> Sighere was the joint king of the Kingdom of Essex along with his cousin Sæbbi from 663/4 to about 688. <P3-S1>  He was son of Sigeberht Sæwarding, probably Saint Sigeberht, but perhaps Sigeberht the Little. <P3-S2>  He was outlived by Sæbbi, who became the sole ruler of Essex after his death. <P3-S3>  Sighere and Sæbbi were cousins of their predecessor Swithelm. <P3-S4>  While Sighere returned to paganism, Sæbbi remained Christian. <P3-S5>  They soon developed a rivalry. <P3-S6>  Sighere found an ally in Wessex, and Sæbbi with Mercia. <P3-S7>  As a result of their rivalry, King Wulfhere of Mercia established himself as overlord of Essex. <P3-S8>  and induced Sighere to marry his niece Osgyth, daughter of Frithuwold, sub-king of Mercia in Surrey. <P3-S9>  Jaruman, the bishop of Mercia, was assigned to reconvert the people of Essex to Christianity. <P3-S10>  In 673, Sighere separated from Osgyth, who then fled to the protection of Bishop Beaduwine of North Elmham. <P3-S11>  Sighere died about 688, and Sæbbi became sole ruler of Essex.