Ghiyath al-Dīn Me’sud ibn Kaykaus or Mesud II (Old Anatolian Turkish: مَسعود دوم, Ghiyāth ad-Dīn Mas'ūd bin Kaykāwūs; Persian: غياث الدين مسعود بن كيكاوس) bore the title of Sultan of Rûm at various times between 1284 and 1308.

He spent part of his youth as an exile in the Crimea and lived for a time in Constantinople, then the capital of the Byzantine Empire.

[2] Ahmad's successor, Arghun, divided the Seljuq lands and granted Konya and the western half of the kingdom to the deposed sultan's two young sons.

Mesud conducted the campaign under the tutelage of the vizier and elder statesman, Fakhr al-Din Ali.

Mesud and his Mongol allies conducted similarly futile expeditions against the Karamanids, Eshrefids and Ottomans.