Black Canary Dinah Laurel Lance was a citizen of Star City and one of its most beloved public servants. Laurel was the eldest daughter of Quentin Lance and Dinah Lance (after whom she was named), the older sister of Sara Lance, and the on/off romantic interest and longtime friend of Oliver Queen. The ex-girlfriend of Tommy Merlyn, she was a lawyer who held the position of Assistant District and was previously a former legal aid attorney. However, after the death of her sister she was inspired to take up vigilantism and received training from Ted Grant and later by her close friend and her sister's former lover, Nyssa al Ghul. She eventually joined Team Arrow and became known as the Black Canary, the second Canary of her beloved city.
From wikia .