Euler was born in Basel to Paul Euler, a pastor of the Reformed Church. His mother was Marguerite Brucker, a pastor's daughter. He had two younger sisters, Anna-Maria and Maria Magdalena. Soon after the birth of Leonhard, the Eulers moved from Basel to the town of Riehen, where Euler spent most of his childhood. Euler started school back in Basel, where he lived with his grandmother. At the age of thirteen he went to the University of Basel. In 1723, he received his Master of Philosophy. At this time, he was receiving Saturday afternoon lessons from Johann Bernoulli, who quickly discovered his new pupil's extraordinary talent for mathematics.