Greek, Latin, Sabaean and Hadhramautic texts preserve the names of a large number of kings of Hadhramaut, but there is as yet no definitive chronology of their reigns. Their capital was Shabwa in the northwest corner of the kingdom, along the Incense Route. Eratosthenes called it a "metropolis". It was an important cult centre as well. At first the religion was South Arabian polytheism, distinguished by the worship of the Babylonian moon god Sin. By the sixth century the monotheistic cult of Raḥmān was followed in the local temple.