These "vici" differed from the planned civilian towns ("civitates"), which were laid out as official, local economic and administrative centres, the "coloniae", which were settlements of retired troops, or the formal political entities created from existing settlements, the "municipia". Unplanned, and originally lacking any public administrative buildings, "vici" had no specific legal status (unlike other settlements) and often developed in order to profit from the presence of Roman troops. As with most garrison towns, they provided entertainment and supplies for the troops, but many also developed significant industries, especially metal and glass working. Some "vici" seem not to have had direct connections to troop placement (e.g., the Vicus Martis Tudertium).