Kingdom of Mercia
For a long time the most powerful of the six kingdoms established by the Saxons, Mercia (border kingdom, or march) covered huge swathes of England (you can see from the map above how big it was) including South Derbyshire, Leicestershire, Nottinghamshire, Staffordshire, Northamptonshire and northern Warwickshire. Like the establishment of many of these early kingdoms, little actual evidence is left to us as to who founded them, but the earliest ruler of Mercia - assuming he existed (yes, that again) - seems to be someone called Creoda, and that’s as much as we know about him. However the next king is a different matter.
Panda, sorry Penda, was supposedly one of the descendants of Woden (Odin) - though how you can be descended from a makey-up figure of fiction you'd have to ask the Saxons I guess - and the Anglo-Saxon Chronicle gives his lineage in a sort of Biblical “Ham-begat-Sham” sort of way like this: “Penda was Pybba's offspring, Pybba was Cryda's offspring, Cryda Cynewald's offspring, Cynewald Cnebba's offspring, Cnebba Icel's offspring, Icel Eomer's offspring, Eomer Angeltheow's offspring, Angeltheow Offa's offspring, Offa Wermund's offspring, Wermund Wihtlæg's offspring, Wihtlæg Woden's offspring”. So now you know.
We’re told Penda came to the throne in 626 and ruled for thirty years - none of these Saxon kings seem to have had anything like a short rule; whether that was because they were very popular or very strong, or because the idea of usurping was not part of the Saxon mindset, I have no idea, but in general as the English royal line got established later on, kings were always being murdered, challenged, deposed and basically the throne was almost interchangeable, a game of musical chairs (or thrones) being played by all claimants. But that’s in the future. Of England’s past. If you know what I mean.
The Battle of Hatfield Chase
Penda teamed up with Welsh king Cadwallon, ruler of Gwynedd, to take on the most powerful Saxon king at the time, Edwin of Northumbria (you probably recall that Raedwald, king of East Anglia, had him set up as ruler) and they met at Hatfield Chase, in Doncaster. It was a revenge battle, as Cadwallon had been defeated by Edwin some years earlier, but having secured the alliance of Penda he was able to return and kill not only Edwin but his two sons, weakening the kingdom and it’s said paving the way for Penda to take the throne of Mercia. Using the old axiom of “divide and conquer” he did exactly that, splitting Northumbria back into the two separate kingdoms it had previously been, Deira and Bernicia. Cadwallon’s triumph would not last long though, as he was defeated and killed the following year at the Battle of Heavenfield, when Oswald, an exile under Edwin, returned from Scotland and attacked Northumbria.
With supposedly the saints on his side - he having dreamed the night before the battle of St. Columba, who promised him victory, and to whom he prayed - Oswald defeated the forces of Cadwallon (this time the Welsh king was alone, without aid from Penda) and killed him, taking the throne of Northumbria as he reunited the two kingdoms into one. His reign would last eight years, after which Penda decided Northumbria had become enough of a threat for him to march against it again, and he met Oswald at the Battle of Maserfield in 641 or 642, where, if this can be characterised as a fight between pagans (Saxons) and Christians (Britons) - which is very much oversimplifying the situation - then the pagans triumphed, as Oswald was not only killed, but dismembered, his head stuck on a pole along with his arms. Poor man went to pieces! Disarmed and lost his head. All right, I'll stop now.
Maserfield left the kingdom of Northumbria weak, as it again divided in two, and secured Penda the title, at the time, of the most powerful king of Mercia. He would push his luck though, always driven by his hatred and/or jealousy of, or covetousness for the kingdom of Northumbria, and it would end up being his undoing. In 655 he marched with a huge force to take Northumbria, now under Oswald’s brother Oswiu (although he had only taken reign over one of the two kingdoms in the split realm). Initially, Oswiu capitulated, buying off the Saxon king, but as Penda began the march home in heavy rain, and as many of his followers and allies deserted him, Oswiu struck, and they fought at the river Winwaed.
Oswiu emulated his brother and appealed for divine assistance, this time cutting out the middle man and going direct to the Big Guy, promising he would have his daughter take the veil (become a nun) if God gave him victory - nobody knows what she thought about it, though I guess back then women did what they were told - and would also build, and I quote*, a s
hit ton of monasteries. God may have considered it, though
hell I could always do with another nun, and who doesn’t need monasteries, shrugged and said
sure, you got a deal. Besides, he may have winked, I
don’t particularly like these pagans with their blood sacrifices and their strange rituals, coming over here, taking our jobs, stealing our women. Or not.
* not a quote
Anyway, the upshot was that Penda’s army - or what remained of it after many had decided that there were perhaps better occupations to pursue in seventh century England - got the s
hit kicked out of it, the Venerable Bede, noted monk, historian and know-it-all citing the heavy rain as one of the bigger factors in the victory of Oswiu, where “many more were drowned in the flight than were destroyed by the sword.” Never rains but it pours, huh? In a slice (sorry) of true poetic justice, Penda was beheaded, and all of his chieftains killed also, along with the East Anglian king, Ah here now, sorry Aethelhere.
Mirroring the fate suffered by its king, Mercia was now beheaded, as in, divided into two, just as Northumbria had been by him, with the victorious Oswiu taking one half, while Penda’s son, Peada, who had converted to Christianity in order to get it on with Oswiu’s daughter, was allowed to rule over the other half. Much good it did him though, as he was murdered a year later, betrayed by the very woman for whose love he had given up his pagan ways.
The defeat of Penda and the death of his son, along with the annexation of Mercia shifted the balance of power back to Northumbria, and also turned the formerly pagan kingdom into a Christian one, meaning that now the two most powerful and influential realms in Anglo-Saxon England were of that faith, and the rest could not be long falling into line, willingly or not.