Explanation

Khalid Bin Waleed (R.A) is widely known by the title "Muslim Alexander". Uqba bin Nafah (R.A) was a prominent companion but not primarily associated with this title. Sa’ad bin Abi Waqas (R.A) was famous for his bravery in battles like the Battle of Mount Uhud. Amr bin Al-Aas (R.A) is known for his role in conquering Egypt and establishing governance there.