Editing Ezio Auditore da Firenze (section)

====Settling into Constantinople====

:''"Welcome to Galata district. For centuries it has been a home to orphans from Europa and Asia alike. You won't find more diversity anywhere else in the city. And for that reason, Assassins make it their home."''
:―Yusuf welcoming Ezio.<sup>[src]</sup>

Having obtained the journal, Ezio made his way to Constantinople by ship, where he hoped to find those Masyaf Keys the Templars had not already obtained. As they neared the port, Ezio briefly spoke with a fellow passenger, a young man who claimed to be a student. Ezio spoke to him of how he spent his own youth, until a woman on the ship caught his attention. Disembarking the ship at the Galata, Ezio was greeted by the leader of the local Assassin guild, Yusuf Tazim.

Yusuf informed Ezio of the state of affairs in the city and of how the Byzantine remnants, allied with the Templars, fought with the Ottomans for control of the city while there was a civil war between the Sultan Bayezid II and his son Selim who claimed the throne. As the Sultan wasn't in the city, the Templars tried to reclaim Constantinople. On their way, the two Assassins were attacked by Byzantines. As Templar backups arrived, the two Assassins were protected by Ottoman guards who chased the Byzantines. Later in the Galata headquarters, Ezio was introduced to some of Yusuf's men, and was advised to get new equipment.

When the two met again, Ezio was provided with an Ottoman hookblade and was taught on its use by Yusuf, in parkour and combat. To test his new skills, Yusuf challenged Ezio to climb the Galata Tower and reached the top before him. After the race, the two were contacted by the Assassin Kasim who warned them that the Templars attacked the Assassin dens of the Galata and the Grand Bazaar. On their way to the Galata den, Yusuf taught to Ezio some assassinating tactics with the hookblade. Arrived at the den, Yusuf decided to defend the Grand Bazar while Ezio organized with other Assassin the defense of the Galata. After the Assassins defeated the Templars at the Galata, Ezio decided to join with Yusuf at the Grand Bazar.

After he crossed the Golden Horn, Ezio fought with Yusuf who was attacked by the Templars. After they succeded, Yusuf informed Ezio that they lost the Grand Bazar den. Together, they decided to reclaim it. As the district was controlled by the Byzantines, the two Assassins stayed low profile and Ezio was introduced by Yusuf to bombs that he could use as a distraction. Arriving near the den, with other Assassins, they infiltrated the area and Ezio killed the Byzantine captain before igniting the signal fire to reclaim the den.

As they lost many Assassins during the attack of the den, Ezio decided to recruit some citizens in the Brotherhood. His first apprentice was a man who was imprisoned for stealing food. Ezio freed him by stealing the key of his cage. Ezio continued to recruit citizens who had useful skills for the Brotherhood or had the will to fight the Templars. Later Ezio investigated the disappearance of many Assassins in the Galata. With another Assassin apprentice, Ezio discovered the corpses of their brothers and sisters killed with Assassin's tactics. As they spotted a mysterious hooded man, they tracked him but he left the area as Byzantines attacked the Assassins. The apprentice revealed to Ezio that the hooded man was Vali cel Tradat, a former Assassin who joined the Templars. As Ezio though that the apprentice wasn't ready to fight Vali, he sent him to a mission in Bursa to perfect his training.

Later, Ezio met again Yusuf who taught him how to craft bombs for any kind of situation. After this Ezio showed to Yusuf the Polo's journal and explained why he was in Constantinople. Yusuf suggested to Ezio to meet Piri Reis, a Master Assassin who was also a cartographer and a bomb crafter, who could help him in his quest. Arriving at his shop in the Grand Bazar, Ezio spoke with Piri who indicated him the location of Niccolò Polo's old trading post, which was now a book shop.

Arriving at the book shop, Ezio met the owner, Sofia Sartor; the woman who had caught Ezio's eye on the ship into the city. While speaking to Sofia, Ezio investigated the place to find some clues. Locating a secret passageway beneath the trading post, Ezio flirtingly suggested they both investigate but was politely rebuked. He then entered the underground cavern, where Templars searching another Masyaf key. Discreetly exploring the underground, Ezio successfully obtaining his first Masyaf Key, as well as an encrypted map. Returning in the book shop, Ezio showed to Sofia the map. Together they saw that the map indicated the location of many books from Polo's library. As Ezio though that some of them could indicate the location of the Masyaf keys, he decided to associate with Sofia who will decode the map while Ezio will give her the books which she could reimprint them.

Leaving the book shop, Ezio met Yusuf and show him the Masyaf key. Yusuf advised to hide it in the Galata headquarters. When Yusuf explained that he needed to meet the different allies of the Assassins as the Mercenaries, the Thieves and the Romanies, Ezio proposed to speak with the last faction as he never truly had contact with them. Yusuf agreed and showed to Ezio the tunnels network to travel more easily in the city. Meeting the Romanies, Ezio discovered that the Templars stole their chest of gold. The Assassin decided to help them using his poison blade to kill the Templars to create the illusion that the chest was cursed by the Romanies. Ezio reclaimed the gold and became an ally of the Romanies, that he could recruit to distract guards when needed. Later, Ezio also helped the Thieves' guild by killing a snitch which impeached them to operate in the city and saved the son of the Mercenaries' leader who was captured by the Byzantines.

In the Galata headquarters, Ezio examined the Masyaf key and understood that it was an artifact of the Isu. With it, he relived a memory of Altaïr Ibn-La'Ahad, when he saved his Mentor Al Mualim from the traitor Haras and became a Master Assassin. Later, the apprentice send in Bursa returned and informed Ezio that Vali kidnapped to Assassins to exchange them against the den of the Galata. Ezio decided to save the Assassins who revealed to him that it was a ruse to draw them from the Galata headquarters. Returning in the area, Ezio and the apprentice witnessed the Templars attacked the headquarters. As Vali flew, Ezio tracked him before the apprentice performed an air assassination on Vali. In his last breath, Vali explained that he joined the Templars as the Brotherhood didn't protect his country, the Wallachia, against Ottoman invasion. After that, the apprentice was granted the rank of Master Assassin and assigned to protect the Galata den.