Conversation so far:
Can you tell me about Vlachs in the 13th century?
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.
Can you tell me what led Simon de Keza writing about the Blacki people?
Archaeological discoveries indicate that Transylvania was gradually settled by the Magyars, and the last region defended by the Vlachs and Pechenegs was between the Olt River and the Carpathians.
What was interesting about how Transylvania  was gradually settled by the Magyars?
Shortly after the Olt region fell, a church was built at the Carta Monastery. Catholic German-speaking settlers known as Transylvanian Saxons began to settle in the Orthodox region.

Question: What happened after they began to settle in the Orthodox region?
Self-contained rewrite: What happened after Transylvanian Saxons began to settle in the Orthodox region?