He himself became King Nang Klao . One of the fascinations of the Thai system of royal rank and title is the subtlety with which the title of a member of the Royal House reveals an exact degree of rank. Apart from the three distinct princely ranks mentioned earlier there are other features of royal titles which further define the holder's true position in the royal hierarchy. In the titles of all princes and princesses of Phra Ong Chao and Chao Fa rank are to be found certain words which also indicate their relationship to the reigning King. These form part of the preamble to the title and in the case of the closest royal relatives indicate the exact relationship.
More distant relatives have a word indicating to which group of princes and princesses they belong.
Somdetch Phra Chao Piya Ther Chao Fa , the younger brother Somdetch Phra Chao Nongya Ther Chao Fa , and so on. These relationship terms change from reign to reign, with the children of one king becoming, perhaps the elder and younger brothers and sisters of the next king. The system applies equally to deceased members of the Royal Family and the late younger brother of a reigning king will become the late uncle of his successor and his title will be altered accordingly. There is thus a gradual and evolving pattern of change within the system of royal titles. Another feature of the precise definition of rank can be found among the regalia of the most senior members of the Royal Family.