The Battle of HarOs was a military conflict fought by the Klingon Empire sometime prior to the mid 24th century. Data created an abstract expressionist painting of the Battle of HarOs, which he presented to Worf as a gift on his thirtieth birthday in 2370. In five alternate realities, Data likewise presented him with a painting of the Battle of HarOs. In two others, the painting depicted a Klingon Vor'cha-class battle cruiser. (TNG episode: "Parallels")

Years later, during his mission to taD, Worf would compare a "hideous" piece of native al'Hmatti art to Data's depiction of the Battle of HarOs. (TNG novel: Diplomatic Implausibility)

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