Khaleesi of the Great Grass Sea, alternatively Khaleesi of Great Grass Sea, is a title claimed by Daenerys Targaryen.
A Game of Thrones
Daenerys Targaryen weds Khal Drogo, becoming his khaleesi. After the khal dies and dragons are hatched amidst his funeral pyre, Dany becomes the leader of a remnant of his Dothraki khalasar.
A Clash of Kings
Daenerys thinks of the Dothraki sea of central Essos as a great grass sea.
A Dance with Dragons
Missandei includes Khaleesi of Great Grass Sea among the various titles of Dany, who now rules the city of Meereen along Slaver's Bay.