LEO IV THE KHAZAR, with CONSTANTINE VI (775-780 AD). AE, Follis. (23mm, 5.7 g) Constantinople. Obv: Crowned and draped half-lenght busts of Leo IV and Constantine VI facing; above, cross. Rev: Crowned facing busts of Leo III and Constantine V, each wearing loros; cross above, B - A across field; in exergue, M over A between X - N.