Tanah sing wis ana ing watesan Mercia lan Wessex diwenehake dening pengadilan Mercian, kaya sing katon ing Charters of Offa, lan putrane Ecgfrith . West Saxon katon migunakaké mata uang Offa: panaliti anyar awal duwitake duwit emas awal ngungkapake rute Offa pennies sing mlaku saka Upper Thames menyang Wareham, sawijining situs sing disambungake karo Beorhtric.