Flavia Auditore

Flavia Auditore was the daughter of the Grand Master of the Assassin Order, Ezio Auditore da Firenze. She was born after her father's travels in Constantinople in 1511, and had one brother, Marcello. She and her brother continued to lead the Assassins after their father´s death.

Source

 * Assassin's Creed Comic-Con 2011 Panel