Originally Posted by
ph2ter
I must admit that before 13th century Bosnia east of Vrbas and north of Neretva rivers was always in some way part of Serbia or under control of Serbia.
Every known historical document testifies this, not only Matej Ninoslav charters.
Einhard from 9th century, DAI from 10th century and Kinnamos from 12th century connect Bosnia with Serbia or Serbs.
When Medieval Bosnia included the lands west of Vrbas (Donji Kraji - Hrvoje Hrvatinić lands), it could no longer use Serbian name in political documents,
because Hrvatinić noble family was of Croatian origin and was very important in Bosnia.
After that, from 14th century Bosnian Medieval political elite started to use Bosniak identification exclusively.