This is a great question Red! As to when, I suggest 2 clues: 1. When the cerebral cortex expanded which allowed the possessor to think in terms of past, present, and future, and, 2. When individuals became so rich and powerful that people looked on them as living god’s.
When people have it good, they want it to last into the future. Once, of course, they could conceive of ‘the Future.’