Sources of historical information on the east African coast before the 7th century?

Before the 7th century, historical information on the East African coast primarily comes from archaeological findings, such as artifacts and settlement remains, which provide insights into trade and cultural interactions. Additionally, writings from ancient travelers and traders, including accounts by Greek and Roman geographers, offer valuable context about the region's connections to the broader Indian ocean trade network. Oral traditions and local histories, though less documented, also contribute to understanding the social and economic dynamics of coastal societies during this period.