Task: Question Answering
Input (English): Context: Archidamus IV (Greek: ) was a king of Sparta from 305 BC to c. 275 BC. He was the 23rd of the Eurypontids, the son of Eudamidas I and Arachidamia and the brother of Agesistrata, the nephew of Agis III and the grandson of Archidamus III. In 296 BC he was defeated by Demetrius I of Macedon. 
 Question: Which woman was the sister of Archidamus IV?
Output (English): agesistrata