Çandarlı Kara Halil Hayreddin Pasha () was the first Grand Vizier of Murad I's reign. He was also technically the first in Ottoman history who held the title "Grand Vizier" (although several before him held equivalent but differently named offices), the first who had a military background (his predecessors under Orhan I came from the class of learned men, the "ilmiye"), and the first member of the illustrious Çandarlı family to hold high office. His family was to mark the rise of the Ottoman Empire between 1360 and 1450.Encyclopedia of the Ottoman Empire. Gábor Ágoston, Bruce Alan Masters. p.398
