MThot

Thot says:
"Welcome here. I am the god of truth. I also invented hieroglyphics. I am also the heart and tongue of Ra as well as the means by which Ra's will is translated into speech. I am involved in arbitration, magic, writing, science, and the judging of the dead. And the question is:"
Which is the name of a god very similar to me, but found in Greece?
Hint: The name starts with H, and as an adjective it means extremely closed.