As local lords, Bushi, started to gain more power by the end of the 12th century, Japan went into an era of battle. As similar necessity arose in European history on the battle field, markings or symbols became much more important to distinguish enemies from allies. Emblems on a flag or banner played an important role in distinguishing enemies; however, the same emblem also appeared on arms, armors, helmets, saddles and a variety of items. The more local lords existed, the more emblems were created.