The so-called "Supremacy" of this kingdom over all lands south of the Humber estuary was set in motion by a victory at (*) Maserfield, the latter of which saw one ruler of this kingdom defeat Oswald of Northumbria.
One ruler of this kingdom heavily funded the Monastery at Medeshamstede, which contained an artifact called the "Hedda stone". A missionary named Chad was heavily responsible for the Christianization of this kingdom, whose power was severely curtailed after a decisive loss at the Battle of Ellendun. One ruler of this kingdom died leading troops against the Bernicians at the Battle of the Winwaed, and allied with Cadwallon ap Cadfan to win the Battle of Hatfield Chase. The final ruler of this kingdom was Aethelfaed, the sister of Edward the Elder. The so-called "Supremacy" of this kingdom over all lands south of the Humber estuary was set in motion by a victory at (*) Maserfield, the latter of which saw one ruler of this kingdom defeat Oswald of Northumbria. One ruler of this kingdom placed his wife Cynethryth on one series of his coinage, and during a conflict with Wales ordered the construction of a barrier between his kingdom and the Kingdom of Powys, his namesake "dyke". For 10 points, name this member of the Anglo-Saxon Heptarchy that was ruled by Offa and Penda, and was located in the English Midlands.
One ruler of this kingdom heavily funded the Monastery at Medeshamstede, which contained an artifact called the "Hedda stone".
{Mercia}