Analysis of information sources in references of the Wikipedia article "Μάνσα Μουσά" in Greek language version.
[Mansa Musa] could not meet his expenses. He therefore borrowed money from the principal merchants. Among those merchants who were in his company were the Banu l-Kuwayk, who gave him a loan of 50,000 dinars. He sold to them the palace which the sultan had bestowed on him as a gift. He [the sultan] approved it. Siraj al-Din b. al-Kuwayk sent his vizier along with him to collect what he had loaned to him but the vizier died there. Siraj al-Din sent another [emissary] with his son. He [the emissary] died but the son, Fakhr al-Din Abu Jafar, got back some of it. Mansa Musa died before he [Siraj al-Din] died, so they obtained nothing more from him.
With his lavish spending and generosity in Cairo, (Mansa Musa) ran out of money and had to borrow at high rates of interest for the return journey. Ibn Battuta says that Mansa Musa borrowed 50,000 dinars from Siraj al-Din ibn al-Kuwayk, a rich merchant from Alexandria, after he had spent all his wealth.
