Final answer:
The 'Martial Emperor' who reigned from 141 to 87 B.C. and held the throne longer than any other Han emperor was Emperor Wu, also known as Wudi.
Step-by-step explanation:
The Han emperor who reigned from 141 to 87 B.C. and held the throne longer than any other Han emperor is known as the 'Martial Emperor.' His name was Wudi, and he is also referred to as Emperor Wu. Wudi adopted a policy of expanding the Chinese empire through war, which earned him the nickname 'Martial Emperor.'