I do imagine this question within myself as God is the creator of all things, I do imagine who created him?
This is a question of a God-seeking person.
As I studied theology at the seminary, we were told that God is not created. He always existed. It is difficult to understand to us, humans, who always see only limited things, with the beginning and the end.
One encouraging question still is in my mind. Would He be God, if He would be created by someone more supreme? No. So, I am glad my God is NR.1 in all things. And even if I don't understand many facts about Him, still, I am glad that I don't understand some things about Him... Or many things.. This really makes Him being God! Otherwise, what a God is That, Who can be totally comprehented by a limited mind. Still, He encourages us to know Him. This sharpens our minds, our personalities, our lives.
Good job with the question!