Question: In the 10th Century A.D. Ealhswith had a son called Æthelweard by which English king?

Context paragraphs:
Mahavamsa: The Mahavamsa ("Great Chronicle", Pali "Mahāvaṃsa") (5th century CE) is an epic poem written in the Pali language of the ancient Kings of Sri Lanka.  It relates the history of Sri Lanka from its legendary beginnings up to the reign of Mahasena of Anuradhapura (A.D. 302) covering the period between the arrival of Prince Vijaya from India in 543 BCE to his reign (277–304 CE).  It was composed by a Buddhist bhikku at the Mahavihara temple in Anuradhapura about the sixth century A.D.

Dhar (surname): Dhar (Kashmiri: धर , دھر ), also spelled Dar mostly in Pakistan(Kashmiri: डार , ڈار ), is a Kashmiri surname (kram), of Brahmin origin, found among individuals native to the Kashmir Valley of India, as well as Kashmiri émigrés who have migrated to the Punjab, a region divided between India and neighbouring Pakistan.  The caste name is shared among both Hindus and Muslims.  The Dhar "kram" originates from the honorific given to a village head, strongman or a warlord of a jagir.  This honorific was prevalent during the 12th Century A.D. and remained in vogue up until the 14th Century A.D.  In antiquity, many Dhars migrated to the region of Gauda (present day Bengal), and much later returned to the Kashmir Valley.  Nevertheless, to this day, there are many Dhars who are found in that region of Bengal, they belong to different castes (mainly Kayastha and Baniks and sometimes Brahmin or Baidya).

Sirpur (Chhattisgarh): Sirpur is a historical town in Mahasamund district in the state of Chhattisgarh 78 km away from Raipur and 35 km from Mahasamund city on the banks of the river Mahanadi.  The town of Sirpur (aka Shirpur) has been mentioned in ancient epigraphic records, dating back to the 5th to the 8th centuries A.D.  The city was once the capital of the Sarbhapuriya and Somvanshi Kings of Dakshin (south) Kosala state.  It was an important centre of Buddhist from the 6th the 10th century A.D. and was visited by Hieun Tsang, the 7th Century Chinese Pilgrimist and Scholar.  The beauty of this magical place has beckoned the presence of the Dalai Lama too in March 2013.

Æthelweard (son of Alfred): Æthelweard (d. 920 or 922) was the younger son of King Alfred the Great and Ealhswith.

Per-Wadjet (Upper Egypt): Per-Wadjet was an Ancient Egyptian town in the 10th Upper Egyptian nome.  The ancient town is identical with the modern village Kom Ishqau.  Per-Wadjet is known from Egyptian sources since the New Kingdom.  It was a cult place for Hathor, who was here identified with Wadjet.  The Greeks identified Hathor with Aphrodite and called the town Aphroditopolis or Aphrodito.  In Greek and Roman times the town was sometimes the nome capital.  In Kom Ishqau were found the papyri of Dioscorus of Aphrodito, who lived there in the 6th century A.D.  These papyri are an important source for life in Byzantine Egypt.

Gangaikonda Cholapuram: Gangaikonda Cholapuram was built during medieval India and was erected as the capital of the Cholas by Rajendra Chola I, the son and successor of Rajaraja Chola, the great Chola who conquered a large area in South India, Sri Lanka, Bangladesh, Sumatra, Kadaram (Kedah in Malaysia), Cambodia and others at the beginning of the 11th century A.D.  It occupies an important place in the history of India.  As the capital of the Cholas from about 1025 A.D. for about 250 years, the city controlled the affairs of entire southern India, from the Tungabhadra in the north to Ceylon in the south and other south east Asian countries.  As of 2014, the ancient city exists as a small forlorn village in the Ariyalur district of Tamil Nadu, India.  The great temple of Brihadeeswarar Temple at this place is next only to the Brihadisvara temple at Thanjavur in its monumental nature and surpasses it in sculptural quality.

Ealhswith: Ealhswith or Ealswitha (died 5 December 902) was the wife of King Alfred the Great.  Her father was a Mercian nobleman, Æthelred Mucel, Ealdorman of the Gaini, which is thought to be an old Mercian tribal group.  Her mother was Eadburh, a member of the Mercian royal family, and according to the historian Cyril Hart she was a descendant of King Coenwulf of Mercia.  She is commemorated as a saint in the Christian East and the West on July 20.

Someshwara Temple: Historically it is said to have been built by Kings of Alupa Dynasty in 10th century A.D.  The temple was under the Administrative rule of Kadambas of Banavasi, and Choula Kings of Ullala of 12th century A.D.  The two inscriptions found in the temple says that it was renovated in 15th century A.D. at the time of Vijayanagara King Immadi Devaraya by Rajaguru Sree Kriyashaktri Devavodeya.

Medieval theatre: Medieval theatre refers to theatrical performance in the period between the fall of the Western Roman Empire in the 5th century A.D. and the beginning of the Renaissance in approximately the 15th century A.D. Medieval Theatre covers all drama produced in Europe over that thousand-year period and refers to a variety of genres, including liturgical drama, mystery plays, morality plays, farces and masques. Beginning with Hrosvitha of Gandersheim in the 10th century, Medieval drama was for the most part very religious and moral in its themes, staging and traditions.  The most famous examples of Medieval plays are the English cycle dramas, the York Mystery Plays, the Chester Mystery Plays, the Wakefield Mystery Plays and the N-Town Plays, as well as the morality play, "Everyman".  One of the earliest surviving secular plays in English is "The Interlude of the Student and the Girl" (c. 1300).

Nilamata Purana: The NIlamata Purana (नीलमत पुराण) is an ancient text (6th to 8th century AD) from Kashmir which contains information on its history, geography, religion, and folklore.  It was used by Kalhana as one of sources of his history.  The dating of the text is based on the following reasoning: "The textual study of the work shows that some alterations and additions have been made in it after the ninth or tenth century A.D. in order to incorporate into it the monistic Saiva Philosophy of Kasmira.  Had the Nilamata been composed after the ninth century A.D. there would have been no scope for such change.  The lower limit of the date thus may be eighth century A. D. and the upper one about the sixth century A.D. as Buddha began to be regarded as an incarnation of Visnu from about 550 A.D."

Supporting paragraphs: Æthelweard (son of Alfred) Ealhswith
Answer: King Alfred the Great