Hamza Ibn Abdul Mutalib Ibn Hashim Ibn Manaf. He was born in Mecca before the Prophet's birth in two years so he was very close to the Prophet . He was also the brother of the Prophet by feeding; (the same woman had feed them both, she was Halima Al-Saadiya). He took the right path and become Muslim in the second year of the Prophet's message after his story with Abu Jahal:
It is recorded that the Prophet was one day seated on Safa when Abu Jahl happened to pass by and attacked the religion preached by him. The prophet Mohammed, however, kept silent and did not utter a single word. Abu Jahl went on unchecked, took a stone and cracked the Prophet’s head, which began to bleed. The aggressor then went to join the Quraishites in their assembly place.
It so happened shortly after that, Hamza, while returning from a hunting expedition, passed by the same way, his bow hanging by his shoulder. A slave-girl belonging to ‘Abdullah bin Jada‘an, who had noted the rudeness of Abu Jahl, told him the whole story of the attack on the Prophet . On hearing that, Hamza was deeply offended and hurried to Al-Ka‘bah and there, in the courtyard of the Holy Sanctuary, found Abu Jahl sitting with a company of Quraishites. Hamza rushed upon him and struck his bow upon his head violently and said: "Ah! You have been abusing Mohammed ; I too follow his religion and profess what he preaches." The men of Bani Makhzum came to his help, and men of Bani Hashim wanted to render help, but Abu Jahl sent them away saying: "Let Abu ‘Ummarah alone, by Allah I did revile his nephew shamelessly."