A good first post.
Astronomers have collected evidence that suggest all galaxies have supermassive black holes at their centres. Their masses are about 0.5 per cent (typically several million to a billion solar masses) of that of their host galaxies.
http://www.nrao.edu/pr/2004/quasarbh/

How they came to exist is a mystery. Which came first, the galaxy or the supermassive blackhole? Or did they form together in the early universe? And if they did form together, how could a young galaxy develop a supermassive black hole so quickly? Is it not more likely that the supermassive black hole was a fragment blasted out from something bigger – an ultra-suppermassive black hole or MABLE, which could be the center of our visible universe? Our visible universe could itself be part of a bigger universe.