Ancient DNA from Pontus kingdom and the genetic legacy of Kaskians.
We have Hellenistic and Roman era samples from Samsun in north Turkey. They are interesting because they give an idea about the population of Pontic kingdom and permit to test some theories about Kaskians in general and Tibaren in particularly. The kingdom of Pontus emerged after the collapse of Achaemenid empire and was centered around modern Amasya and Samsun.
The most frequent type is the Samsun_Anc_A. Dated from 177BC to 300AD. They had a typical Anatolian genetic profile. They are more western relative to Amasya_EBA which is in most likelihood related to Greek migrations. Nevertheless Greeks didn't replace completely the local population which has its deep roots in Palaic, Kaskian Paphlagonian and Tibaren periods.
The current data means that the population preceding Greeks was predominantly Anatolian Chl/EBA like which is confirmed by Amasya EBA samples. They lack extra CHG both in EBA and Hellenistic periods. It's worth to note that modern Turkey North cluster also do not have extra CHG.
Steppe ancestry was absent in EBA as in most Anatolia. Later in Hellenistic/Roman period Steppe appears at low level.. The Y dna we have from this period are G, J2 and T1a.
Those results are supporting the idea that Kaskians were local North Anatolian population probably affiliated to Hattic. Tibia was an important Kaskian town from which their king originated. So it's quite possible that Tibarens were simply an offshoot of Kaskians and their name was related to Tibia. In Greek period Tibios was a generic name given to all Paphlagonians.
There was also a single outlier Samsun_Anc_B dated at 170BC with obvious West Caucasian origin. She was not admixed with locals but was buried with them. This means that she migrated in her lifetime. The closest populatipn to her are Svans. She has a very high CHG unusual for that region and even for modern Laz. There was no information about her social status and a special burial type. So she was probably part of that period's main society. Another possibility is that we see here the apparition of Zan tribes (attested as Sannoi). The earliest mentions of terms related to Zan, Sanni and Tsan coincide with this period by Strabo. Although to confirm a migratory theory more samples are needed from more Eastern regions.