A short time after the "Little Judgment Day," and after the failed attack on the Assassin headquarters in Galata, Hasan received a letter from Prince Ahmet, telling him about the Prince's uncle, Cem, who he mentioned as the one responsible for starting the Ottoman and Byzantine Templar goal. In the same letter, Ahmet told Hasan of Niccolò Polo's journal, and what it contained. He then further instructed Hasan to "scour the tunnels beneath the Topkapı Palace."