Haile Selassie was the last emperor of Ethiopia.
His real name was Tafari Makonnen Woldemikael.
The term Ras means head but also Prince as in “head of state”.
The song’s lyrics are directly related to Rastafarian beliefs. Zion is “the promised land”, in the song referring to Ethiopia. The lion refers to the Lion of Judah, which appeared on the old royal Ethiopian flag, and represents Haile Selassie I, the former Ethiopian emperor whom Rastafarians regard as their Messiah.
Haile Selassie was a direct descendant of King Solomon and the Queen of Sheba.
According to an article on Topix:
Emil Mitchell, Ardzouri Vaspurkan, Nazbanu daughter of Yazderged III from Parsi and Yazdegerd III who from Shushandukt the daughter of 21th Exilarh Mar Abba and who descend from Zerubbabel or Daniel an Exilarch Prince who descend from Rehoboam or Menelik son Jewish Solomon and Black Sabean the Queen of Sheba all who those allele blood type and B- Blood type. Hallie Salassie family was B- blood type originally.
More here: The History of Ethiopia