Epic feuds and hip-hop are tied at the waist, coming from the streets where rap battles began. Some stars, like Eminem, owe their street-cred to their prowess on the rap battle front.
In the 1990s we had the arguably most notorious feud, the East Coast/West Coast beef that saw a couple of rappers gunned down, including the two most critically acclaimed rappers of all time Tupac Shakur and The Notorious B.I.G.