Ayutthaya historical documents show the official titles of the kings in great variation; Indra , Shiva and Vishnu , or Rama . Seemingly, Rama was the most popular, as in 'Ramathibodhi'. However, Buddhist influence was also evident as many times the king's title and 'unofficial' name Dhammaraja , a abbreviation of the Buddhist Dharmaraja . The two former concepts were re-established, with a third, older concept taking a more serious hold. This concept was called “ Devaraja ”