 The kings of the Empire period began acting as a high priest for the whole kingdom—making an annual tour of the Hittite holy cities, conducting festivals and supervising the upkeep of the sanctuaries.During his reign (c. 1400 BC), King Tudhaliya I, again allied with Kizzuwatna, then vanquished the Hurrian states of Aleppo and Mitanni, and expanded to the west at the expense of Arzawa (a Luwian state).Another weak phase followed Tudhaliya I, and the Hittites' enemies from all directions were able to advance even to Hattusa and raze it.