Several different cultural traditions stand out in Long Barrow Culture. Some of them are characteristic of the Baltic Finno-Ugrians, others of the Balts and Slavs. The aim of this work is to distinguish all these mentioned traditions that are manifested in warrior horseman’s accoutrements and riding gear of the fifth to seventh centuries. From the armament point of view, both Slavic tribes and the inhabitants of the Byelorussian and west Russian forest belt, whose ethnocultural affiliation remains disputed (Balts, Slavs, Balto-Slavs, Finno-Balts, Finno-Ugrians?), comprise an integral continuum from the River Danube to Lake Ladoga. The work also discusses the migrational processes that affected the people in the forest belt in the fifth and sixth centuries.