Imru al-Qays ibn Amr ibn Adi, commonly known as Imru al-Qays I, was the second Lakhmid king. His mother was Maria bint 'Amr, the sister of Ka'b al-Azdi. There is debate on his religious affinity: while Theodor Nöldeke noted that Imru al-Qays ibn 'Amr was not a Christian Irfan Shahid argued for a possible Christian affiliation, noting that Imru al-Qays' Christianity may have been "orthodox, heretical or of the Manichaean type". Furthermore Shahid asserts that the Namara inscription which mentions Imru al-Qays ibn Amr lacks Christian formulas and symbols. Al-Tabari states that "he ruled for the Persians in all the land of the Arabs in Iraq, Hejaz and Mesopotamia". Imru al-Qays is called in his epitaph inscription: "The king of all Arabs who owned the crown," while the same title (king of all Arabs) was the title given to the kings of Hatra. The same inscription mentions that Imru al-Qays reached as far as Najran and besieged it from the king, Shammar Yahri'sh. Some scholars have identified "Imru al-Qays ibn Amr" in some South Arabian inscriptions with that one. In those same inscriptions his name is mentioned along with Shammar Yahri'sh, the Himyarite king.