Definition: Intgsys3 refers to a series of ancient Greek and Roman administrative divisions that existed in the first century after Jesus Christ's birth, known as the "Catholic Church." Each division was assigned its own bishop or patriarch. Definition: The term "intgsys3" typically refers to a series of pre-Christian, early Christian ecclesiastical regions which were ruled by bishops. These territories included Rome and certain colonies in Africa, Asia Minor, and Cyprus. They were the first Christians to establish their own religious organization and governance structures.