Ibn Khaldun's Audience with Timur beneath Damascus

Ibn Khaldun relates in the first person in "The Lessons" his meeting with Timur during the siege of Damascus in 803 AH. ²

When the sultan Faraj learned that Timur had returned to Syria, he gathered his armies, and Ibn Khaldun travelled with them in the middle of Rabi al-Awwal, although he had been removed from his post. He remained in Damascus at the Adiliyya madrasa with the judges and jurists. ²

The judge Burhan al-Din told him that Timur had asked for him. He asked the judges to let him go out at the gate, and they lowered him from the wall. Timur's men and his deputy Shah Malik received him and brought him to Timur. He greeted him and made a gesture of submission, and Timur stretched out his hand and he kissed it, and gestured to him to sit. The jurist Abd al-Jabbar ibn al-Nu'man translated between them. ²

Timur asked him where he had come from and why, then they spoke about kingship and group feeling. Ibn Khaldun wrote him a description of the lands of the Maghrib, and he ordered it translated into the Mughal tongue. ²

Ibn Khaldun says that he gave him a copy of the Qur'an, a prayer-rug, a copy of the Burda and boxes of sweets. He asked him for a letter of safe conduct for the people of Damascus, and he wrote it for him. He returned to Egypt in Sha'ban 803 AH. ²

Everything above is from Ibn Khaldun's account alone. What other sources confirm of it needs an additional source.