Final answer:
Justinian accomplished several significant achievements as a ruler, including implementing laws relating to religion, imposing Roman law, and pursuing military conquests.
Step-by-step explanation:
Justinian accomplished several significant achievements as a ruler. Firstly, he was deeply religious and implemented laws that addressed religious matters and funded the construction of churches, including the iconic Hagia Sophia.
Secondly, Justinian imposed Roman law on all his subject peoples. He codified Roman law in the Corpus Juris Civilis, which remains influential in European legal systems today.
Lastly, Justinian aimed to re-conquer the Western Roman Empire from Germanic kings and pursued Christian uniformity by combating heresies and persecuting heretical sects.