User blog comment:Captain Warrior/Nas vs Jay Z. Rivalry Rap Battles Episode 1./@comment-3401602-20170204204549

If you want to do more battles about rap beefs, there's:

Biggie vs Pac

NWA vs NWA (the group split up and started dissing each other, most notably with Ice Cube and Eazy-E)

Kendrick Lamar vs like literally every rapper (Kendrick name-dropped a ton of rappers in his verse on "Control", which stirred up a lot of popularity and lots of rappers recorded response verses to it. Could be an interesting royale battle.)