The changelog contained the message "Removed Herobrine". This was Notch "joking" when removing parts of the coding for the Human mob. This and the following three "Herobrine removed" mentions that appeared in Betas 1.7, 1.7_01 and 1.8.1 removed the individual class files for the Human, merely making it somewhat of a default mob. It could still be spawned, but it possessed the default health, (10 hearts) spawn conditions, (Light level 7) melee attack, view distance, and various other parameters shared by all other hostile mobs at the time. The mob at this time now was called "Monster" instead of "Human". The "Removed Herobrine" message was mentioned again in the Beta 1.8 changelog, where all the code for the human mob had been disabled/removed, and the ability to hack the mob into the game with spawn commands or spawners was removed. In the 1.0, 1.2, 1.3 and 1.4 updates, Jeb wrote "Removed Herobrine" again, but as a "joke". From the Minecraft wiki.
