The Lakhmid dynasty () referred to in Arabic as al-Manādhirah (, romanized as: ) or Banu Lakhm (, romanized as: ) was an Arab kingdom in Southern Iraq and Eastern Arabia, with al-Hirah as their capital, from the late 3rd century to 602 CE. They were generally but intermittently the allies and clients of the Sasanian Empire, and participant in the Roman–Persian Wars. While the term "Lakhmids" has also been applied to the ruling dynasty, more recent scholarship prefers to refer to the latter as the Naṣrids. The Nasrid dynasty authority extended over to their Arab allies in Al-Bahrain and Al-Yamama. When Khosrow II deposed and executed Al-Nu'man III, the last Nasrid ruler, his Arab allies in Najd rose in arms and defeated the Sasanians at the battle of Dhi Qar, which led to the Sasanians losing their control over Eastern Arabia. The victory at Dhi Qar roused confidence and enthusiasm among the Arabs seen as the beginning of a new era. Coupled with increasing instability in Persia proper after the downfall of Khosrow in 628, these events heralded the decisive Battle of Qadisiyya in 636 and the Muslim conquest of Persia. Nomenclature and problems of Lakhmid history The nature and identity of the Lakhmid kingdom remains mostly unclear. The ruling Nasrid family emerges with "Amr of the Lakhm", mentioned in the late 3rd-century Paikuli inscription among the vassals of the Sasanian Empire. From this, the term "Lakhmid" has been applied by historians to the Nasrids and their subjects, ruled from al-Hirah. However, as historian Greg Fisher points out, there is "very little information about who made up the people who lived in or around al-Hirah, and there is no reason to suppose that any connection between Nasrid leaders and Lakhm that may have existed in the third century was still present in the sixth, or that the Nasrids ruled over a homogeneous Lakhmid kingdom". This situation is exacerbated by the fact that the historical sources—mostly Byzantine—start dealing with the Lakhmids in greater detail only from the late 5th century, as well as by the relative lack of archaeological work at al-Hirah. History The Lakhmid Kingdom was founded and ruled by the Banu Lakhm tribe that emigrated from Yemen in the second century. The founder of the dynasty was 'Amr, whose son Imru' al-Qais (not to be confused with the poet Imru' al-Qais who lived in the sixth century) is