The lion is the king of beasts because it is named after King Leonidas who conquered many fights.
The lion got the name because of the mane, which gives it a regal look.
They don't want to know how it got it's name. The mane is kind of like a crown for the lions, which makes it a 'king'. The lion is also strong, fast, and can destroy any other animal that gets in its way. (Except for the elephant, the lion has to be in a group to.)
The lion is called the King Of Beasts, but in reality, it is the second most powerful cat, after the somewhat larger tiger.
Lions are often referred to as "the king of the beasts."