The nine rulers of Aryavrat who were defeated by Samudragupta were important regional powers during his time. Samudragupta was an influential ruler of the Gupta Empire, which existed from the 4th to the 6th century CE in ancient India. His military campaigns and conquests played a significant role in expanding the empire's boundaries and establishing its supremacy over various regions. Let us delve into the details of the nine rulers and their defeats at the hands of Samudragupta.

1. The ruler of Magadha:
- Samudragupta's first conquest was over the ruler of Magadha, who was defeated and brought under Gupta control.
- This victory provided a strong base for further expansion towards the eastern regions of India.

2. The ruler of Kosala:
- Samudragupta then targeted the ruler of Kosala, who was defeated and his kingdom was incorporated into the Gupta Empire.
- This conquest helped in consolidating the empire's control over the central regions of India.

3. The ruler of Kalinga:
- The ruler of Kalinga, who was known for his naval power, was defeated by Samudragupta.
- This victory extended Gupta influence to the eastern coastal regions and facilitated maritime trade and control over important ports.

4. The ruler of Vatsa:
- The ruler of Vatsa, a significant kingdom in central India, was also defeated by Samudragupta.
- This conquest further solidified Gupta dominance in the central regions and enhanced their territorial control.

5. The ruler of Ashmaka:
- Samudragupta's next target was the ruler of Ashmaka, who was conquered and brought under Gupta rule.
- This victory expanded the empire's influence in the western Deccan region.

6. The ruler of Avanti:
- The ruler of Avanti, a powerful kingdom in present-day Madhya Pradesh, was defeated by Samudragupta.
- This conquest further strengthened Gupta control over central India and helped in securing important trade routes.

7. The ruler of Gandhara:
- Samudragupta's military campaigns extended beyond the Indian subcontinent to the northwest region.
- The ruler of Gandhara, located in present-day Afghanistan and Pakistan, was defeated by Samudragupta.
- This victory brought the northwestern region under Gupta influence and facilitated trade with Central Asia and beyond.

8. The ruler of Parasika:
- The ruler of Parasika, another important kingdom in present-day Pakistan and Iran, was also conquered by Samudragupta.
- This conquest further expanded the Gupta Empire's territorial control in the northwest region.

9. The ruler of Hunas:
- The Hunas, a powerful nomadic tribe from Central Asia, posed a significant threat to the Gupta Empire.
- Samudragupta successfully defeated the Hunas and prevented their invasion, ensuring the security of the empire's northwestern borders.

Overall, Samudragupta's military campaigns and conquests were instrumental in establishing Gupta dominance over a vast expanse of territory, ranging from present-day Afghanistan and Pakistan to various parts of India. These victories not only expanded the empire's boundaries but also contributed to economic prosperity, cultural exchange, and political stability during the Gupta period.