He is best known for relocating the Hittite capital to Tarhuntassa,[2] appointing his brother Hattusili as governor in Hattusa, and fighting Ramesses II in the Battle of Kadesh.

Egyptologists[citation needed] suspect that some time prior to Ramesses II's accession to the Egyptian throne, Muwattalli had reached an informal peace treaty or understanding with Seti I over Kadesh to avoid a clash between the two powers over control of Syria.

In it, Seti effectively ceded Kadesh to the Hittite king in order to focus on domestic issues in Egypt.

At the start of Muwatalli II's reign the capital of Hatti was Hattusa, located in the northern region of Anatolia.

The first theory is that Muwatlli II moved the capital because of the border skirmishes between the Hittites and the Kaska, and later the rebellion by Piyamaradu.

This new location was not only farther away from the troublesome northern border, but it was also strategically better for the upcoming fight against Egypt over Syria.

[7] The main evidence for this is how the depiction of the Storm God on his royal seals changes significantly after the expulsion of Danuhepa.

Muwatalli II introduces a new motif for seals that is followed by all the Hittite kings that rule after him: the Umarmungsszene (German) (the protective embrace of the deity).

[8] The relief of Muwatalli II is located near Sirkeli Höyük, which is one of the largest settlement mounds in Plain Cilicia.

The appearance of King Muwattalli is consistent with the way the Sun God of Heaven (Nepisas Istanu, or Simige) was portrayed in Hittite iconography; so this indicates deification.

He became the king of Hatti after the death of his father Muwatalli II, but was overthrown 7 years later by his uncle Hattušili III.

This is because after the battle, Muwatalli II continued to expand into Syria and the Egyptian expansion was stopped in the area of Palestine.