The Gandhi Series of banknotes are issued by the Reserve Bank of India (RBI) as the legal tender of Indian rupee. As the name suggests, the series is so called because the obverse of the banknotes prominently display the portrait of Mahatma Gandhi.
The series was based on this photograph of Gandhi and Lord Pethick-Lawrence. Lord Frederick William Pethick-Lawrence was a British Politician. He was a leader of the woman suffrage movement in Great Britain during the first two decades of the 20th century and then served as the secretary of state of India and Burma
Source: Mahatma Gandhi Series