Çandarlı Kara Halil Hayreddin Pasha (Ottoman Turkish: چندارلی کارا حلیل خير الدين پاشا) 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 came from the class of learned men, the "ilmiye"), and the first member of the illustrious Çandarlı family to hold high office.
[1] He was a successful commander, setting the precedent for centuries of Ottoman presence in Albania after his victory at the Battle of Savra.
He rose to the rank of grand vizier from the position of the chief military judge (kazasker) in September 1364 and held this top seat after the sultan until his death on January 22, 1387.
[2] As such, he became the grand vizier who had the longest term of administration, a record he would hold until the abolition of the position 535 years after his death in 1922.