I'm glad you asked because I got curious too.

Baron Munchausen
Munchausen syndrome is named after Baron Munchausen, a literary character loosely based on the German nobleman Hieronymus Karl Friedrich, Freiherr von Münchhausen (1720–1797). Baron Munchausen was known for telling wild, unbelievable tales about his exploits and past. Munchausen syndrome is a rare psychological and behavioural condition in which somebody fabricates or induces symptoms of illness in themselves. The condition was first named as "Munchausen syndrome by proxy" in 1977 by British pediatrician Roy Meadow.
Wikipedia
+3