Tal'Diann is a fleet of the New Romulan Republic, and is allied with the Orion Syndicate and the Klingon Empire. Tal-Diann is a fleet of the New Romulan Republic, and is allied with the Vulcan Confederacy and the United Federation of Planets. ((Tal'Diann and Tal-Diann are fleets in the MMORPG "Star Trek Online."))
You will wish to begin with the "Pathal" box and work your way through. The Briefings ((Blog)) section of the Web-Embassy can be examined afterwards.