Small decorated tripodal chairs are common enough as finds from Mycenaean Greece. They tend to look more or less like so but more elaborate ones can be found. Oftentimes they have figures seated in them, like in the second image. Sometimes these are identified as a deity or ruler on a throne, although it's often unclear what precisely is being represented. In any case, such chairs were certainly familiar to the Mycenaeans, although I can't say anything about how common they would have been as furniture.