Was considered a mediocre emperor and was killed by a member of his own guard.

a.
trajan
b.
constantine
c.
marcus aurelius
d.
commodus

Option D.

Explanation:

Commodus, is the right answer.

Commodus ruled the Roman empire with his father Marcus Aurelius until the death of his father and solely until 192. Lucilla, his sister conspired against him with a group of senators to kill him. The conspiracy abandoned, and Commodus took the revenge by executing several influencing senators. However, in the year 186, he was executed by his chief minister to appease the army.

`stare decisis is a legal doctrine that obligates courts to follow historical cases when making a ruling on a similar current or future case. stare decisis ensures that cases with identical facts be approached in the same way, unless overruled by the same court or a higher court such as the us supreme court. simply put, it binds courts to follow legal precedents set by previous decisions.

stare decisis is a latin term meaning "to stand by that which is decided".