Final answer:
Justinian proved the strength of his faith through drafting religious laws, funding the construction of churches, and publishing theological discourses.
Step-by-step explanation:
Justinian, the Eastern Roman emperor from 527 to 565, proved the strength of his faith through various actions. First, he drafted laws that specifically addressed religious matters, showing his devotion to Christianity. Additionally, Justinian funded the construction of numerous churches, including the impressive Hagia Sophia in Constantinople. Furthermore, he published theological discourses during his reign, demonstrating his interest in religious debates and theology.