The Thai Royal Guards were established by King Chulalongkorn the Great of Thailand in 1859, when he was still crown prince

Crown Prince

A crown prince or crown princess is the heir or heiress apparent to the throne in a royal or imperial monarchy. The wife of a crown prince is also titled crown princess....

. Initially, the Royal Guards were servants with duties such as scaring crows, which led to commoners referring to them as the "Mahardlek Laikar," roughly translated as "Scarecrow Corps."

When he succeeded his father in 1868, King Chulalongkorn took his Royal Guard and formed a 24-strong Royal Bodyguard, referred to as the "Taharn Songlow" (Two-Dozen soldiers"). In 1870, the Royal Guard regiment were given the name the "King's Guard" and their duties included escorting the king while he travelled around the country.

About the year 1875 the necessity for survey

Survey

-Quantitative research:* Statistical survey, a method for collecting quantitative information about items in a population* Paid survey, a method that companies use to collect consumer opinions about a product by paying consumers for participating in the survey...

s in connection with improvements in the city of Bangkok, and for supervision in carrying out these improvements, led to the selection of certain officers of the royal bodyguard for training in this direction. These officers were formed into a special company called "Military Engineers of the Royal Bodyguard," in which Mr. James McCarthy held the rank of captain; but on Thursday, September 3, 1885, a royal decree was issued separating the surveyors from the royal bodyguard and creating the Royal Survey Department, which is now a Royal Thai Armed Forces Headquarters  Special Services Group, the Royal Thai Survey Department (.)

The Royal Guards still exist down to the present and serve as protectors of the Royal Family of Thailand.