Who has introduced Gallop Rhythm in Metal Band Music firstly?

Iron Maiden's 1982 song "The Number of the Beast" is often cited as the first heavy metal song to prominently feature the gallop rhythm, a fast-paced, eighth-note-based pattern that creates a sense of urgency and excitement. Other bands, such as Motörhead and Raven, had also used the gallop rhythm prior to Iron Maiden, but "The Number of the Beast" helped popularize the style and make it a staple of heavy metal music.