King of Kings by M.J Porter

Athelstan is the king of the English, uniting the petty kingdoms of Wessex, Mercia, the Danish-held Five Boroughs and York following the sudden death of his father, King Edward.
His vision is to unite the realms of the Scots and the Welsh in a peace accord that will protect their borders from the marauding threat of the Norse Vikings.
Whilst seemingly craving peace and demanding loyalty with an imperium over every kingdom, Athelstan could dream of a much bigger prize.
But danger and betrayal surround his best intentions, namely from his overlooked stepbrother, Edwin, who conspires and vies for what he deems is his rightful place as England's king.
Another good read by the author , I look forward to the 2nd instalment.
Full of interesting facts weaved through the story and the characters for the timeline perfectly.