Samuel Hahnemann, the founder of homoeopathy, practised in Köthen from 1821 to 1834, and during this period he published many of his best-known works. In 1855 his disciple Arthur Lutze opened a palatial homoeopathic clinic. Hahnemann's home is now open to tourists, and includes an actual working homoeopathic practice. The city has become the national center of homeopathy, location of congresses, and the seat of the new European Homeopathic Library. In 2013, the international homoeopathic medical society, "Liga Medicorum Homoeopathica Internationalis", relocated its main operations to Köthen, so the city now is kind of a "world's capital of homoeopathy".