Refers to the style and period associated with the reign of King Suryavarman I (1002-1050 CE), generally considered the first Buddhist ruler of Angkor. The period is characterized by prolific building programs that included sandstone constructions of minor temples and of the Royal Palace that featured the first fortified wall encompassing a palace in Angkor, storehouses and treasuries known as Khleang, and a single central tower-sanctuary rather than the more commonplace five towers in quincunx configuration. Examples of other architectural and sculptural innovations of this period exist on the site of Preah Vihear where series of courts and gopuras are set on a longitudinal axis rather than in concentric enclosures.