Alfred appointed his son-in-law Earl Æthelred of Mercia, the heir to the destroyed kingdom of Mercia, as Governor of London and established two defended Boroughs to defend the bridge, which was probably rebuilt at this time.
Alfred udnævnte sin svigersøn jarl Æthelred af Mercia, der var arving til det tilintetgjorte Kongeriget Mercia, som guvernør over London og opførte to borge til forsvar af broen, der formentlig var blevet genopbygget på det tidspunkt.