From 1001 Arabian Nights. There was once a sultan of India who had three sons. Hussein was the oldest son, Ali was the middle son, Reading Is Fundamental (RIF) Three Princes: Wheeler, Ramona - Amazon.com
In some Middle Eastern folk tales, a Sultan cannot choose which of his three sons—Hussein, Ali, and Ahmed—should marry their cousin, Princess Nouronnihar. He sends them on a quest to find the most "extraordinary object," leading to the discovery of a magic carpet, a telescope, and a healing apple. tripleprinces full
Based on the life of Persian King Bahram V, the story follows three brothers from Serendip (modern-day Sri Lanka) sent by their father to travel the world and gain wisdom. From 1001 Arabian Nights
In a political context, the term refers to a specific group of leaders in during the mid-20th century: Prince Boun Oum: Represented the right-wing royalists. Prince Souvanna Phouma: Led the neutralist faction. He sends them on a quest to find