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This is the first of a series of works devoted to investigate cool dwarfs inwide multiple systems. Here, I present Koenigstuhl 4 A and B, two bright,intermediate M dwarfs with a common high proper-motion and separated by 299arcsec. At the most probable distance of the system, 19 pc, the projectedphysical separation is 5700 AU, which makes Koenigstuhl 4 AB to be one of theleast bound binary systems with late-type components found to date. I alsoassociate the primary with a ROSAT X-ray source for the first time.

Cool dwarfs in wide multiple systems: Paper I: Two mid-M dwarfs in a loosely-bound common-proper-motion pair