Hattusili I in Wikipedia
Hattusili I (Ḫattušili I) was a king of the Hittite Old Kingdom. He reigned ca. 1586–1556 BC (short chronology).
He used the title of Labarna at the beginning of his reign. It is uncertain whether he is the second king so identified, making him Labarna II, or whether he is identical to Labarna I, treated as his predecessor in Hittite chronologies.
During his reign, he moved the capital from Neša (Kaneš, near modern Kültepe) to Ḫattuša (near modern Boghazkoy), taking the throne name of Ḫattušili to mark the occasion.
He is the earliest Hittite ruler for whom contemporary records have been found. In addition to "King of Ḫattuša", he took the title "Man of Kuššara", a reference to the prehistoric capital and home of the Hittites, before they had occupied Neša.
A cuneiform tablet found in 1957 written in both the Hittite and the Akkadian language provides details of six years of his reign. In it, he claims to have extended Hittite domain to the sea, and in the second year, to have subdued Alalakh and other cities in Syria. In the third year, he campaigned against Arzawa in western Anatolia, then returned to Syria to spend the next three years retaking his former conquests from the Hurrians, who had occupied them in his absence.