Taghlibs
The great Basus War, which was between the Taghlibs and the Bakrs, lasted for approximately forty years until the Lakhmids king of al-Hirah, 'Amr ibn Hind, urged them to make peace with each other on condition that some of their children were to be taken hostages by the king.
The King of Hira said one day to his drinking companions, "Do you know anyone among the Arabs whose mother declines serving my mother?" They replied, "Yes, Amr Ibn Kulthum." The king asked, "Why is that?" His companions replied, "Because her father is Al-Muhalhel Bin Rabī'ah, her uncle is Kolaib a prestigious Arabian, her spouse is Kulthum Ibn Malik Ibn Etab an astounding knight of Arabs and her son is Amr ibn Kulthum chief of his clan."
After that the king sent for Amr Ibn Kulthum asking him to visit along with his mother Layla. Kulthum accepted the king's invitation and visited him with his companions and his mother. After they arrived and while Layla was sitting, the mother of the king (the aunt of Imru' al-Qais) Hind asked her to pass the plate, to which Layla replied, "let the one in need go to her need" and when Hind insisted, Layla shouted saying: "What a humiliation!"
Her son heard her and was so deeply stirred by the insult that he took his sword and decapitated the king of al-Hirah and killed his guards then left.
Read more about this topic: Amr Ibn Kulthum