Final answer:
Emma of Normandy and Aethelred the Unready had three children: Edward the Confessor, Alfred Aetheling, and Goda of England.
Step-by-step explanation:
The question 'How many children did Emma have with Aethelred?' refers to Emma of Normandy, who was married to Aethelred the Unready, an Anglo-Saxon king of England. Historical records indicate that Emma of Normandy and Aethelred the Unready had three children together.
Their names were Edward the Confessor, Alfred Aetheling, and Goda of England. Edward the Confessor later became the King of England following the reigns of his half-brother Harthacnut and his stepbrother Harold Harefoot, sons of Emma and her second husband, King Canute.