Jamaica’s anthem was adopted upon independence in 1962. The music and lyrics were created separately and then arranged by Mapletoft Poulle and submitted to the National Anthem Committee where it was selected in a competition for a national anthem. (The first word of the second line is often sung as “Guide”, although “Guard” remains official.)
As a constitutional monarchy with the British royal family as its head of state, the British royal anthem serves as the royal anthem of Jamaica as well.