Final answer:
Gratian's 'The Concordance of Discordant Canons' is also known as 'Decretum Gratiani', a crucial amalgamation of religious and secular law that influenced legal principles throughout the middle ages.
Step-by-step explanation:
Gratian's The Concordance of Discordant Canons, a significant work in the field of canon law, is also commonly referred to as Decretum Gratiani. This landmark publication served as the first codification of canon law that combined both religious and secular laws into a single system. It played a pivotal role in the development of legal principles in the Middle Ages and beyond, shaping the Church's response to societal and religious challenges.
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