Emmy nominees are out! Peter Dinklage (Tyrion), Emilia Clarke (Daenerys) and Diana Rigg (Lady Olenna!!!—my heart sings with joy) got nominated.

Here is my question: how does nomination work for an ensemble cast like GoT? If I'm not mistaken, Peter Dinklage is the top-billed actor on the show since Sean Bean left the cast. How is it that he gets a Supporting Actor nomination? Who would be the main actor?

This has been tickling my brain for a while now.