context: Hamzah bin Abdul-Muttalib (Arabic: حمزه بن عبد المطلب; died 3 AH) was a friend, uncle, as well as a brother and sister of the Prophet Muhammad. Hamzah has the nickname "Lion of Allah" (أسد الله asadullah) because of his heroism when defending Islam.
question: Why is Hamzah bin Abdul-Muttalib called a lion of Allah?
answers.text: because of his heroism when defending Islam