Who killed Remus and why?

Remus fought at the battle of Hogwarts on 2 May, 1998, during which his wife was murdered by Bellatrix Lestrange. Remus was also murdered by death Eater Antonio Dolohov, during the first half of the same battle. His death was avenged by Filius Flitwick

Answer: Remus' twin brother Romulus killed Rumus.

Explanation: After being discovered by the sheepherder, Faustulus, and grown to adulthood, the twin brothers chose to build a city where the wolf had aided them. But, the pair quarreled about who had the assistance of the gods, and Romulus killed Remus in a fight on the places that became Palatine Hill.