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Born in Erode, Madras Presidency, to a poor Brahmin family, Ramanujan first encountered formal mathematics at age 10. He demonstrated a natural ability, and was given books on advanced trigonometry written by S. L. Loney. He mastered them by age 12, and even discovered theorems of his own, including independently re-discovering Euler's identity. He demonstrated unusual mathematical skills at school, winning accolades and awards. By 17, Ramanujan conducted his own mathematical research on Bernoulli numbers and the Euler–Mascheroni constant.Ramanujan is widely rated as the greatest mathematician of the 20th Century. A lot can be said about the work he has done and about his discoveries and his analytical theory of numbers and his works on elliptic functions, continued fractions, and infinite series