Rajah Muda is a rank/title bestowed upon me by Grand Master Porferio S. Lanada of the Arnis Lanada system.
The literal translation of Rajah is "King" and Muda is "Designated Heir".
Within Arnis Lanada, there is a formal ranking structure from the Muslims - the originators of the Filipino martial arts. And the formal ranking with Islamic titles and certification is bestowed upon those that have embraced the system and proven their loyalty. Thus, jakan is related to one of the sacred pillars in monastic temples, while lakan means lord or chieftain (for males) and is considered an equivalent of a black belt ranking. The term dayang is the female equivalent. A datu is a local chieftain, while rajah signifies royal. And so, anyone holding a rank of rajah is considered to be a "prince" of arnis.