Question

who was the become first king in the world

Answer 1

Alfred the Great was King of Wessex and – after defeating the Vikings – King of the Anglo-Saxons. He never called himself King of England and never ruled more than about one third of England. 
In my point of view
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Answer 2

The answer is Sargon.He had expanded into Egypt, India and Ethiopia. (tales say)
Hope it helps!