Leonhard Euler was born on April 15, 1707, in Basel, Switzerland. His forebears settled in Basel at the end of the sixteenth century. His great-great-grandfather, Hans Georg Euler, had moved from Lindau, on the Bodensee (Lake Constance). They were, for the most part, artisans; but the mathematician’s father, Paul Euler, graduated from the theological department of the University of Basel. He became a Protestant minister, and in 1706 he married Margarete Brucker, the daughter of another minister. Euler had two younger sisters, Anna Maria and Maria Magdalena, and a younger brother, Johann Heinrich. In 1708 the family moved to the village of Riehen, near Basel, where Euler spent his childhood.