Drawn by User:IMeowbot; border data from CIA, people locations from The Historical Atlas by William R. Shepherd, 1926 edition, with clarifications supplied by en:User:Everyking per references used in en:Penda of Mercia.
Hmm, there's nothing very united about these kingdoms, feel free to reclassify if you've a better idea!
Ofbyldkeppelings
Dizze siden binne keppele oan it ôfbyld: