A cella (from Latin for small chamber) or naos (from the Greek ναός, "temple") is the inner chamber of an ancient Greek or Roman temple in classical antiquity. Its enclosure within walls has given rise to extended meanings, of a hermit's or monk's cell, and since the 17th century, of a biological cell in plants or animals. Greek and Roman temples In ancient Greek and Roman temples the cella was a room at the center of the building, usually containing a cult image or statue representing the particular deity venerated in the temple. In addition, the cella may contain a table to receive supplementary votive offerings such as votive statues of associated deities, precious and semi-precious stones, helmets, spear and arrow heads, swords, and war trophies. No gatherings or sacrifices took place in the cella as the altar for sacrifices was always located outside the building along the axis and temporary altars for other deities were built next to it. The accumulated offerings made Greek and Roman temples virtual treasuries, and many of them were indeed used as treasuries during antiquity. The cella was typically a simple, windowless, rectangular room with a door or open entrance at the front behind a colonnaded portico facade. In larger temples, the cella was typically divided by two colonnades into a central nave flanked by two aisles. A cella may also contain an adyton, an inner area restricted to access by the priests—in religions that had a consecrated priesthood—or by the temple guard. With very few exceptions, Greek buildings were of a peripteral design that placed the cella in the center of the plan, such as the Parthenon and the Temple of Apollo at Paestum. The Romans favoured pseudoperipteral buildings with a portico offsetting the cella to the rear. The pseudoperipteral plan uses engaged columns embedded along the side and rear walls of the cella. The Temple of Venus and Roma built by Hadrian in Rome had two cellae arranged back-to-back enclosed by a single outer peristyle. Etruscan temples According to Vitruvius, the Etruscan type of temples (as, for example, at Portonaccio near Veio) had three cellae, side by side, conjoined by a double row of columns on the facade. This is an entirely new setup with respect to the other types of constructions found in Etruria and the Tyrrhenian side of Italy, which have one cell with or without columns, as seen in