g) Robert Bruce was a famous king.

Here is the coherent order of the sentences:

1. g) Robert Bruce was a famous king.
2. e) Enemies invaded his kingdom.
3. h) The king fought bravely but lost the battle.
4. f) He had to flee from his kingdom and took shelter in a remote cave to save his life.
5. d) The king was always in a gloomy state for his unhappy condition.
6. j) Once, Bruce was lying in the cave and saw a spider trying hard to reach the ceiling.
7. b) The spider failed again and again to succeed but did not give up hope.
8. c) This dauntless spider climbed the ceiling after some unsuccessful attempts, inspiring Bruce to shake off the darkness of despair.
9. i) He gathered an army of strong men and attacked his enemies.
10. a) The enemies were defeated and Bruce regained his kingdom.

The correct order is:
g, e, h, f, d, j, b, c, i, a