Azog.

Father of Bolg, Azog killed Thror in Moria cut his head of and branded his name in dwarf-runes on the brow of Thror. This was rhe drop which startet the war between Dwarfs and Orcs and ended in the battle of Nanduhirrion. Azog was killed by Dain Ironfoot before the Eastern gate of Moria in the battle of Nanduhirion in T.A.2799 after Azog had slain Nain. (Hob+LotR)

Related links.: Battles.: War of Orcs and Dwarves.