Speak with Barenziah
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Location: Royal Palace Throne Room, Tienius Delitian

If you get the message from Tienius to speak with Barenziah, it only means that you are about to be sent over to the Temple to complete more quests. This is not a real quest. Nothing will update in your journal when you speak with her. Your work on the Monarchy side, for now, is done. Speak with her in her chambers, and she'll let you in on the fact that there are two opposing sides, and to not be judgmental until you figure it out for yourself. She wants you to go over to the Temple and speak with Fedris Hler, who will offer you more quests. Don't worry about going back to Tienius after speaking with Barenziah. He won't recognize that you did and keep sending you back.