(covers information from several alternate timelines)
This page contains information regarding new Star Trek material, and thus may contain spoilers.
In 2016, a Vulcan starship crossed into Klingon space near H'atoria and was immediately destroyed by the Klingons. In the aftermath, Vulcans established a policy of firing first when encountering Klingons, earning their respect and eventually leading to the establishment of formal relations. (DIS: "The Vulcan Hello")
Background information Edit
"ha-TORE-ee-uh" was the pronunciation for this planet's name from the script pronunciation guide. 
According to the Star Trek: Star Charts (p. 56) and the Stellar Cartography: The Starfleet Reference Library ("Stellar Cartography", p. 29 & 30; "Federation Historical Highlights, 2161-2385"), the planet H'atoria was located in the H'atoria system. This was a binary star system located in the Beta Quadrant. Both H'atoria A and H'atoria B were Class M stars. According to a map of the Klingon Empire – prepared by the Scribe K'Tark for the Klingon High Council in the Year of Kahless 893 (2366) – H'atoria was identified as a Klingon system.