During the nineteenth century, Karl Freiherr von Rokitansky conducted research on the causes of disease by performing approximately 30,000 autopsies, a practice that many people opposed at the time. Rokitansky performed his research in pathology, or the study of disease, and morbid anatomy, or the study of dead bodies, in Vienna, then part of the Austrian Empire and later part of Austria. In 1860, Rokitansky studied the growth of abnormal uterine tissue, and was one of the first to detect endometriosis, or endometrial tissue growth outside of the uterus, which helped future researchers further identify and understand endometriosis.