There are few historical attestations that Viking Age women took part in warfare. The Byzantine historian John Skylitzes records that women fought in battle when Sviatoslav I of Kiev attacked the Byzantines in Bulgaria in 971. When the Varangians (not to be confused with the Byzantine Varangian Guard) had suffered a devastating defeat in the Siege of Dorostolon, the victors were stunned to discover armed women among the fallen warriors.