Western Armenia , also referred to as Byzantine Armenia , later Turkish Armenia , or Ottoman Armenia is a term coined following the division of Greater Armenia between Byzantine Empire ( Western Armenia ) and Persia ( Eastern Armenia ) in 387 AC . Western Armenia ( Western ) , also referred to as Byzantine Armenia , later Turkish Armenia , or Ottoman Armenia is a term coined following the division of Greater Armenia between Eastern Roman Empire ( Western Armenia ) and Persia ( Eastern Armenia , Persarmenia ) in 387 .