Mani flourished under the Romans, because of its respectful obedience to Rome. The Koinon consisted of 24 cities (later 18), of which Gythium remained the most prominent. However, many parts of Mani remained under the also semi-independent (autonomous under Roman sovereignty) Sparta, the most notable being Asine and Kardamyli. Mani became a center for purple dye, which was popular in Rome, as well as being well known for its rose antique marble and porphyry. Las is recorded to have been a comfortable city with Roman baths and a gymnasium.