:::The formation of a Bulgarian nationality with the merger of Bulgars and Slavs was a lengthy process that actually began with the creation of the state in 681 and finished in 9th-10th centuries but there is no way to determine a date of the consolidation. And there are absolutely no differing characteristics before and after 913. The First Bulgarian Empire is treated as one entity from 681 until 1018 and I think that Wikipedia should adhere to this.