Friedrich August von Hayek was born in Vienna to August von Hayek and Felicitas Hayek ("née" von Juraschek). His father, born in 1871 also in Vienna, was a medical doctor employed by the municipal ministry of health. August had a passion for botany, about which he wrote a number of monographs and was also a part-time botany lecturer at the University of Vienna. Felicitas von Juraschek was born in 1875 to a wealthy conservative and land-owning family. As her mother died several years prior to Hayek's birth, Felicitas received a significant inheritance, which provided as much as half of her and her husband's income during the early years of their marriage. Friedrich was the oldest of three brothers, Heinrich (1900–1969) and Erich (1904–1986), who were one-and-a-half and five years younger than he was.