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I must clarify that my knowledge of the specific event in 725 CE involving Nala and Daksina uniting as Bana is limited. There is no widely documented historical event or record from that time period that matches this description. It is possible that this refers to a regional or lesser-known historical event, a mythological or literary reference, or a misinterpretation of historical records.
If you could provide more context or clarify the source of this information, I would be happy to assist further or help explore related historical topics from that era. For example, the 8th century was a time of significant developments in various parts of the world, including the rise of the Tang Dynasty in China, the expansion of the Islamic Caliphate, and the consolidation of regional powers in India. Let me know how I can assist!