Arbaaz Mir was a Kashmiri member of the Indian Brotherhood of Assassins based in Amritsar during the 19th century. He was the husband of Princess Pyara Kaur of the Sikh Empire and the father of Jayadeep Mir, as well as an ancestor to the Indian actress Monima Das. Born in the Kashmir region of India, Arbaaz lost his family at a young age, when his home was conquered by Maharaja Ranjit Singh, leading him to resent the ruler for most of his life. Forced to survive on the streets, Arbaaz became a thief until an encounter with the Assassin Mentor Hamid, who brought him into the Brotherhood and trained him to the rank of Master Assassin. In 1839, Arbaaz became entangled in a conflict with the British Templars over the Koh-i-Noor, a Piece of Eden of immense power which was guarded by Ranjit Singh. Infiltrating the Maharaja's summer palace, Arbaaz met Singh's granddaughter Pyara Kaur, who helped him in his quest to recover the Koh-i-Noor in exchange for protecting her grandfather from the Templars. Although the Assassin ultimately failed to rescue Singh, he managed to keep the Koh-i-Noor out of the Templars' hands and subsequently entered into a relationship with Pyara. In 1841, after the Templars stole the Koh-i-Noor from the Brotherhood, Arbaaz embarked on a mission to recover the Piece of Eden. Discovering the Templars to also be in possession of a Precursor box, which they used in conjunction with the Koh-i-Noor to reveal the locations of several Isu temples, Arbaaz followed them to Afghanistan, but was captured. Taken to Punjab, Arbaaz soon managed to escape and recovered the Koh-i-Noor and Precursor box in the process. However, he ultimately lost the box during a confrontation with the Master Templar William Sleeman, who took Pyara hostage, forcing Arbaaz to rescue her. Later, Arbaaz met the British Assassin Ethan Frye and gave him the Koh-i-Noor in order to hide it. After the birth of his son Jayadeep, Arbaaz contacted Ethan, with whom he had become good friends, to train the boy as an Assassin. However, Jayadeep possessed a weakness for violence, which created a rift in his relationship with his father, especially after Arbaaz was forced to intervene and save Jayadeep during a mission. When his son was sentenced to death by the Brotherhood for his failure, Arbaaz did not interfere, but was eventually convinced by Ethan to banish the boy to England as an alternative punishment.