Final answer:
The Kshatriya class served as the warrior-rulers in the Vedic civilization, which was a hierarchical society based on the varna system. The priestly Brahman caste held the highest position, legitimizing rulers through Vedic rituals, and influential emperors like Chandragupta Gupta played significant roles in unifying and developing the civilization.
Step-by-step explanation:
The warrior-ruler of the Vedic civilization was referred to as the Kshatriya, which is part of the varna system that arose during the Vedic period. These members of noble families functioned as rulers who protected their kingdoms and carried out conquests to expand their domains. The varna system was a four-fold classification system that included the Brahmans at the top, followed by the Kshatriyas, Vaishyas, and Shudras.
The Kshatriyas' legitimization as rulers often involved Vedic rituals such as the horse sacrifice, which signified royal sovereignty. The Brahmans, as the priestly and highest caste, had authority derived from their expertise in sacrificial rituals and their guardianship over the sacred texts. Over time, rulers like the Gupta dynasty's emperor Chandragupta and his son Samudragupta expanded and unified much of India, blending their love for arts and science with the martial sovereign role of Kshatriyas.