Abibus of Samosata died in 297.

Eusebius of Samosata died in 379.

Romanus of Samosata died in 297.

No, Paul of Samosata and Paul Saul of Tarsus are not the same person. Paul of Samosata was a bishop of Antioch in the 3rd century who held unorthodox views on the nature of Jesus, while Paul of Tarsus, known as Saint Paul, was an apostle and early Christian missionary who wrote many of the New Testament letters.

It is unknown when and where he was born. However, he was crucified in 297 at Samosata.