Tudhaliya I flourishes around in the early fourteenth century as an early ruler in the Hittite Empire period.
Proper numbering of the Hittite rulers who bore the name Tudhaliya is problematical.
There was a Hattian era figure who bore the name Tudhaliya who may or may not have ruled as king.
Other reconstructions insert a Tudhaliya directly after Muwatalli I, but before the Tudhaliya discussed here.
Some scholars call Tudhaliya I the first king of the New Kingdom, or Empire.
Others give this honor to Suppiluliuma I. Tudhaliya may have been the grandson of the Middle Kingdom ruler Huzziya II.
He may have been the direct successor of Muwatalli I, having overthrown him.
The exact sequence of succession at the beginning of the New Kingdom is uncertain, however, because of the difficulty of placing Hattusili II.
Tudhaliya I's reign includes a period of co-regency with Arnuwanda I, his son-in-law and adopted son.
The most famous event of Tudhaliya's reign is his conquest of the Assuwa league, a confederation of states in western Anatolia formed to oppose the Hittite empire.
The list of its members contains twenty-two names, including [...]uqqa, Warsiya, Taruisa, Wilusiya and Karkija (Caria).
Assuwa is believed to be the origin of Asia.
Of the many component territories within Assuwa, Wilusiya is commonly identified with Ilion (Troy) and Taruisa with the surrounding Troad, and Warsiya may be associated with Lukka (Lycia).
However, identification of [..]uqqa with later-attested Lukka (Lycia) is problematic, because that would put the Assuwa league both north and south of Arzawa in southwestern Anatolia.
Assuwa appears to lie north of Arzawa, covering the northwestern corner of Anatolia.
Tudhaliya I temporarily opens the southeastern routes to Syria by defeating Aleppo and halting the expansion of the Hurrian state of Mitanni.
He also campaigns against enemies in the Anatolian west and southwest in an attempt to reconquer previously held territories, but with only temporary success.
Arnuwanda, who succeeds Tudhaliya, proves unable to defend even the core of the revived Hittite kingdom against continuing attack from all sides. (His successors—Hattusilis II, Tudhaliya II, and Arnuwanda II—will be no more successful.)