The rulers in ancient times recorded their victories on hard surfaces like copper and stone plates. This is because of the following reasons:
1. The inscriptions on the stone and copper plates are clear, legible and do not wear away easily.
2. The victories and achievements of the rulers could be read by the people. This would make them aware of the ruler's authority and power.
3. The records last for a longer time and people of the future periods come to know about the history. This makes the rulers and their achievements everlasting and creates a legacy.