Final answer:
The Fourth Lateran Council required Jews to wear distinctive clothing, such as a badge, to distinguish them from Christians, which was part of the church's efforts to regulate interactions between Christians and non-Christians in the medieval period.
Step-by-step explanation:
The Fourth Lateran Council, convened in 1215, was significant in the history of relations between Christianity and Judaism. It enforced several measures against Jews, which included the requirement that they wear distinctive clothing, specifically a badge, to distinguish them from Christians.
This decree was part of a series of canons aimed at regulating non-Christian communities and their interactions with Christians. The council was a manifestation of the church's increasing effort to define and assert its authority over various aspects of medieval life, including its relationship with the Jewish community.