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More than 3,000 years ago, Ongal was home to the Moesi who were subdued by the Roman general Crassus around 29 BC. The political independence of Old Great Bulgaria, like other nomadic state formations, did not last long. United by Khan Kubrat, the Bulgar tribes quickly divided after his death sometime around 660. Most of the Asparuh Bulgars settled in the area around the Ongal, called Scythia Minor. In the Ongal area, fortifications were found that had lasted for about 20 years.
- "Битката при Онгъл – победата, която положи основите на Дунавска България | Българска история". Българска история (in Bulgarian). 2014-05-27. Retrieved 2017-09-18.
- Онгъла мит или реалност
- "Истинската българска история! :: НЕЩО ИНТЕРЕСНО ЗА ОНГЪЛА И КНЯЗ АСПАРУХ". sparotok.blog.bg (in Bulgarian). Retrieved 2017-09-18.