La Lex Irnitana de El Saucejo Historical milestone · El Saucejo, Sierra Sur, Seville Image of El Saucejo, not of the place itself. At the site of Irni, in its district, the most complete known copy of the Lex Irnitana, a Roman Flavian municipal law, was found, now in the Archaeological Museum of Seville. El Saucejo, born as farmsteads of the duchy of Osuna, established its own parish in 1661 and became an independent municipality by royal decree in 1838. 1661 (fundación de la parroquia); 1838 (independencia municipal) Photo: CarlosVdeHabsburgo (CC BY-SA 4.0) What to see and do in El Saucejo