Original sentence: 420 AD in the Brythonic kingdom of Manaw Gododdin (approximating modern Clackmannanshire in Scotland), centred on the Firth of Forth in the area known as Yr Hen Ogledd
Edited sentence: 420 AD in the Brythonic kingdom of Manaw Gododdin (modern Lothian in Scotland), centred on the Firth of Forth in the area known as Yr Hen Ogledd