While visiting the royal Mercian court at Sutton Walls with a view to marrying princess Ælfthryth, King Æthelberht II of East Anglia is taken captive and beheaded.

Mercia was one of the principal kingdoms founded at the end of Sub-Roman Britain; the area was settled by Anglo-Saxons in an era called the Heptarchy. It was centred on the River Trent and its tributaries, in a region now known as the Midlands of England.

Sutton Walls Hillfort, in the parish of Sutton, Herefordshire, is an elongated ovoid Iron Age hill fort located 4 miles (6 km) north of the city of Hereford, England. It was added to the Sites and Monuments Record in 1988.

Ælfthryth, also known as Alfreda, Alfritha, Aelfnryth, or Etheldritha, is a Mercian princess, saint, virgin, and recluse, venerated in both the Catholic Church and Antiochian Orthodox Church. She was a daughter of King Offa of Mercia and his consort, Cynethryth.

Æthelberht, also called Saint Ethelbert the King was an 8th-century saint and a king of East Anglia, the Anglo-Saxon kingdom which today includes the English counties of Norfolk and Suffolk. Little is known of his reign, which may have begun in 779, according to later sources, and very few of the coins he issued have been discovered. It is known from the Anglo-Saxon Chronicle that he was killed on the orders of Offa of Mercia in 794.

Decapitation is the total separation of the head from the body. Such an injury is always fatal to humans and all vertebrate animals, since it deprives the brain of oxygenated blood by way of severing through the jugular vein and common carotid artery, while all other organs are deprived of the involuntary functions that are needed for the body to function. The term beheading refers to the act of deliberately decapitating a person, either as a means of murder or as an execution; it may be performed with an axe, sword, or knife, or by mechanical means such as a guillotine. An executioner who carries out executions by beheading is sometimes called a headsman. Accidental decapitation can be the result of an explosion, a car or industrial accident, improperly administered execution by hanging or other violent injury. The national laws of Saudi Arabia and Yemen permit beheading. Under Sharia, which exclusively applies to Muslims, beheading is also a legal punishment in Zamfara State, Nigeria. In practice, Saudi Arabia is the only country that continues to behead its offenders regularly as a punishment for capital crimes. Cases of decapitation by suicidal hanging, suicide by train decapitation and by guillotine are known.