Abu Bakr and Kajak

Al-Mansur Sayf al-Din Abu Bakr and Al-Ashraf Ala al-Din Kujuk were the first two sons of Al-Nasir Muhammad ibn Qalawun to rule Egypt and Syria, respectively. However, their reigns were very short, as the real power lay with Prince Qusun al-Nasiri. Al-Nasir Muhammad ibn Qalawun had designated Abu Bakr as his successor. Sayf al-Din Abu Bakr was a handsome young man, dark-skinned and slender, around twenty years old. He was known among the people for his generosity, friendliness, and strong ambition, but he was unable to control the government. Serious unrest erupted among the Mamluk princes, culminating in his deposition and exile, along with his brothers, to Qus in Upper Egypt. He was killed there after ruling for only two months. His brother, Kujuk, then a young child of seven, succeeded him. Qusun became the de facto ruler, which provoked objections from many princes. The situation worsened when the princes of Syria rejected him, leading to a revolt. He was arrested and exiled to Alexandria, and the young Sultan Kujuk was deposed on the pretext of his young age after only five months on the throne. The sons of al-Nasir Muhammad, whom Qusun had imprisoned in Qus, were released. Kujuk, after his deposition, remained in the citadel under his mother's care, and was later killed in his bed in Siryaqus in 1345, at about twelve years of age.

The coins of Abu Bakr and Kujak are considered Islamic rarities, and only about one dinar each has been found and sold at auctions.