In the Kosala Sutta (AN 10.29) it quotes the following:
"As far, bhikkhus, as this thousandfold world system extends, Mahābrahmā there ranks as the foremost."
So basically as far as the sun and the mood illuminates the light a world system is there. 4 hells, human world , 6 humans and so forth. And thousand of this is called a thousandfold world system.
So according to the above quote, does this mean that there is only one Maha Brahma to all these thousand world systems? Or are there 1000 Maha Brahmas in this thousand world system? Or is it just 1?