This made Sirindhorn second - in - line to the throne ( after Vajiralongkorn ) until the birth of Princess Bajrakitiyabha in 1978 .
Head entity: vajiralongkorn Q548733 13
Tail entity: bajrakitiyabha Q448071 20
Relation (head \u2192 tail): P40
Inverse relation (tail \u2192 head): P22