Did you know that the smell of Juana of Castile's room must have been so awful that they thought she had been possessed by the devil, that the Aztecs worshipped Montezuma with golden vessels full of lice, that Isabel II was one of the queens who made the filthy Elizabethan green fashionable, or that the Romans discussed the problems of the Empire in the toilet? Oh, hygiene! A taboo subject for many of our ancestors and a luxury reserved for only a few. Or so you have been told, because the vision of cleanliness and sanitation over the centuries has been as changeable as the history of mankind itself. The historian Alejandra Hernández, known in networks by @tcuentounahistoria, immerses us in a somewhat scatological journey through the latrines of Rome, the luxury toilets where the great kings did their needs or the seven hundred donkeys needed to fill Cleopatra's bathtub with milk.