The coolest part about each culture having different interpretations of history and their own versions of the different gods with their own names for them is that every interpretation is true. All different interpretations of the god of time Akatosh that you mentioned are all true, all exist, and are all the same being and unique separate beings simultaneously. In the elder scrolls universe if a large enough group of people all believe something it becomes true.
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The coolest part about each culture having different interpretations of history and their own versions of the different gods with their own names for them is that every interpretation is true. All different interpretations of the god of time Akatosh that you mentioned are all true, all exist, and are all the same being and unique separate beings simultaneously. In the elder scrolls universe if a large enough group of people all believe something it becomes true.