The position of a kamnan was introduced with the Thesaphiban administrative reforms near the end of the 19th century, first enacted in 1892.
Originally, it was a lifetime post, but now is for a fixed term.
The kamnan's main task was to implement the policies of the higher administrative levels, and he was the main point of government contact for the people of the tambon.
The lifetime appointment also was replaced by a five-year term of office.
"Tambon Administration Organization: Are the people in the dramatis personae or in the audience?"