Comte Pierre de Polignac , a great - great - grandson of the first duke , married Princess Charlotte , Duchess of Valentinois and was the father of Rainier III , Prince of Monaco .
Head entity: rainier iii, prince of monaco Q185025 28 29 30 31 32 33
Tail entity: pierre de polignac Q958562 1 2 3
Relation (head \u2192 tail): P22
Inverse relation (tail \u2192 head): P40