As far as we know, Teres II concluded the tradition of extremely fat coins produced by Odrysian kings. This was started by his grandfather, Amatokos, and continued by his father Amatokos II.
Teres seems to have come to power after his father seemed to have been killed by Philip II in 352 BCE. We use the word “seems” a lot, because in truth the ancient sources just stop talking about one guy and start talking about a new one. In those days, it was a fair assumption that previous rulers didn’t abdicate or retire to Aruba.
Teres II kept his throne for some time by helping Philip take down their mutual enemy Kersebleptes. However, eventually Philip felt he wanted all of Thrace, so Teres was booted as well.
There’s some thought that Seuthes III may have been a descendant of Teres II.
Philip II attacks and defeats Kersebleptes due to his attack on Amatokos II, who disappears from sources. Teres II seems to take over.
Teres II allies with Philip II against Kersebleptes and keeps his throne.
Philip II undertakes a campaign against Thrace and presumably ousts Kersebleptes and Teres II.