Hacı İlbey (also known as Hadji Ilbeg or Haji Bey; c. 1305-1365 or 1371) was an Ottoman commander during the early years of the empire.
He was a commander of the Beylik of Karasi, a principality situated at the Asiatic coast of the Dardanelles strait.
Hacı İlbey was tasked with conquests in Rumeli (European portion of Turkey), where the Turks under Süleyman Pasha, son of the Ottoman Beylik's second ruler Orhan, had set foot in 1354.
[2] While the new sultan Murad I was occupied in capturing Biga (Pigas of the antiquity) in Anatolia, a Crusader army appeared near the river Maritsa in Rumeli.
According to a legend, he was poisoned by Lala Şahin Pasha, a senior Ottoman commander, who was Hacı İlbey's rival and worried of his increasing reputation.