A villa might be quite palatial, such as the villas of the imperial period, built on seaside slopes overlooking the Gulf of Naples at Baiae; others were preserved at Stabiae and Herculaneum by the ashfall and mudslide from the eruption of Mount Vesuvius in 79, which also preserved the Villa of the Papyri and its library. Smaller in the countryside, even non-commercial villas operated as largely self-supporting units, with associated farms, olive groves, and vineyards. Roman writers refer with satisfaction to the self-sufficiency of their villas, where they drank their own wine and pressed their own oil, a commonly used literary "topos". An ideal Roman citizen was the independent farmer tilling his own land, and the agricultural writers wanted to give their readers a chance to link themselves with their ancestors through this image of self-sufficient villas. The truth was not too far from the image, either, while even the profit-oriented "latifundia", large slave-run villas, probably grew enough of all the basic foodstuffs to provide for their own consumption.