Asterion Moloc is Chapter Master of the Minotaurs. Checkout Forge World if you want more information on him. He's a pretty awesome character. Easily one of my favourite chapter masters and the start of my Minotaurs force.
I chose not to use the cloak that came with the miniature, not sure why but it didn't look right to me and aside from that the sculpt itself seemed a bit strange. It didn't look natural. Anyway I think he looks just as imposing and cool without it.