In this episode, we explore the history of Indian influence on Southeast Asia, tracing how maritime trade, religious exchange, and political ideas helped shape the region from antiquity through the late Middle Ages. The discussion highlights the process of Indianization, as local kingdoms adopted Hinduism, Buddhism, Sanskrit, Indian concepts of kingship, temple architecture, law, and literature while adapting them to their own cultures. From Thailand and Indonesia to the Philippines, Southeast Asian societies absorbed Indian ideas through trade routes, missionary activity, and diplomatic ties, giving rise to powerful Indianized states and empires. The episode also examines how these influences gradually evolved as Islamic and European powers entered the region, leaving behind a lasting Indosphere legacy in language, religion, art, governance, and cultural identity.