Tudhaliya III
Tudhaliya III was a king of the Hittite Empire. In academic literature, this name can refer to two separate individuals. One is known under the Hurrian name Tasmi-Sarri. He could also be referred to as Tudhaliya II or Tudhaliya III.
The other was a short-lived king of the Hittite Empire (New Kingdom) ca. 1370 BC (middle chronology) : 230 or 1344 BC (short chronology) also known as Tudhaliya the Younger (Amelie Kuhrt refers to him as Tudhaliya III).
This Tudhaliya the Younger was the son of Arnuwanda I, and the brother of Suppiluliuma I. He is not explicitly known to have been king at all.
According to Kuhrt (2020), Tudhaliya III (or II) was the successor of Arnuwanda I. Further, Suppiluliuma I was the son and eventual heir of Tudhaliya II/III.: 252