Some historical info about the region of Alattyán:

The town is in the region "Jaszag" and its name comes from the people called "Jasz". Jasz people were originally Sarmatian, they were still speaking their unique language until 14th century. Sarmatians were a coalition of nomadic tribes and they invaded Europe from the north of Black Sea. Most of the scientists believe that King Arthur legend was revealed after Sarmatians. Today the only Sarmatian people left is Ossetians (descendants of Alans) living in the North Caucasus. 

In history there were three main tribes, Alans, Roxalans and Iasyges (the last one is actually our Jasz people) and they were speaking almost the same language. No written record left from the historical Jasz language, except one example. Within this example Jasz prince salutates Hungarian king and this salute is still easily understood by modern Ossetian.

There is a strong ground for King Arthur theory, as 5.500 Iasyges cavalrymen were sent to north Britain by Romans to defend the Hadrian Wall against local tribes.

Regards, 
respendial