Conversation so far:
What happened regarding the Vlachs in the 13th century?
In 1213 an army of Romans, Transylvanian Saxons, and Pechenegs, led by Ioachim of Sibiu, attacked the Bulgars and Cumans from Vidin.
Why did the Romans, Saxons, and Pechenegs attack the Bulgars and Cumans?
Who was successful in the 1213 Vlachs battle?
After this, all Hungarian battles in the Carpathian region were supported by Romance-speaking soldiers from Transylvania.
Did anything else happen regarding the Vlachs in the 13th century besides the 1213 battles?
At the end of the 13th century, during the reign of Ladislaus the Cuman, Simon de Kéza wrote about the Blacki people and placed them in Pannonia with the Huns.

Question: what was special about these people?
Self-contained rewrite: What was special about the Blacki people