13th century scholar , Amir Khusrow , mentioned the names of two sons of Bughra Khan - Qaiqabad and Rukunuddin Kaikaus but he did not mention the name of Shamsuddin Firoz .
Head entity: rukunuddin kaikaus Q7378899 19 20
Tail entity: bughra khan Q2787241 14 15
Relation (head \u2192 tail): P40
Inverse relation (tail \u2192 head): P22