Conversation so far:
Can you tell me about Vlachs in the 13th century?
In 1213 an army of Romans (Vlachs), Transylvanian Saxons, and Pechenegs, led by Ioachim of Sibiu, attacked the Bulgars and Cumans from Vidin.
Can you tell me what led to this?
At the end of the 13th century, during the reign of Ladislaus the Cuman, Simon de Keza wrote about the Blacki people and placed them in Pannonia with the Huns.
Was there anything else interesting about that?
Catholic German-speaking settlers from Rhineland and Mosel Valley (known as Transylvanian Saxons) began to settle in the Orthodox region.
What happened after they began to settle in the Orthodox region?
The Orthodox Vlachs spread further northward along the Carpathians to Poland, Slovakia, and Moravia and were granted autonomy under Ius Vlachonicum.
Was there any controversy?
In 1285 Ladislaus the Cuman fought the Tatars and Cumans, arriving with his troops at the Moldova River.
Was anyone hurt or killed?
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In 1290 Ladislaus the Cuman was assassinated; the new Hungarian king allegedly drove voivode Radu Negru and his people across the Carpathians, where they formed Wallachia.

Question: Anything important that happened after that?
Self-contained rewrite: Anything important happened after the formation of Wallachia?