You remind me of the Richest person of all time, benevolent African King Musa Keita - He conquered 24 cities and traveled far and wide, giving away so much gold, the market value of gold temporarily declined. After reigning for 25 years, Mansa Musa died in 1337. He was succeeded by his son, Maghan I. To this day, there are mausoleums, libraries, and mosques that stand as a testament to this golden age of Mali’s history.
Then there was the first Buddhist emperor and his reign of peace...
The world’s first Buddhist ruler, Ashoka the Great (Asoka, Ashoka), ruled a truly massive kingdom...his first conquest left a hundred thousand men dead at his army’s hands, and Ashoka, in horror, turned to Buddhism. “True conquest,” he said, is to win the hearts of men by the law of duty and piety.
Reverence for life, tolerance, compassion and peaceful co-existence were the cornerstones of his administration. Under him the earliest known bans on slavery and capital punishment as well as environmental regulations came into place.

We have had great, rich, powerful, benevolent leaders in the past. Why didn't their legacy last?

https://carolkean.wordpress.com/2014/12/09/the-mark-of-nine-new-world-order-peace-and-asoka/