A year later , King Chulalongkorn elevated the oldest , full - blooded prince among his sons , Prince Vajirunhis ( 1878–1895 ) to the position of " Crown Prince " (; ) .
Head entity: vajirunhis Q6636215 19
Tail entity: chulalongkorn Q158861 5
Relation (head \u2192 tail): P22
Inverse relation (tail \u2192 head): P40