The Yamato period, spanning from roughly the 3rd to the 7th century, marks the emergence of Japan's first centralized political power. At the heart of this transformation was the Yamato clan, a dominant force that laid the foundation for Japan's imperial lineage. While early Japan was fragmented into numerous rival clans, the Yamato rulers gradually asserted their dominance, forging alliances, engaging in warfare, and adopting foreign influences to solidify their authority.

One of the key factors behind the Yamato clan's rise was its strategic control over fertile land in the Kinki region, an area well-suited for agriculture. This economic advantage allowed them to amass resources necessary to support a growing military force. By subjugating neighboring clans or bringing them under their influence through political marriages and alliances, the Yamato rulers expanded their reach across central and western Japan. The development of a hierarchical system of governance helped them maintain order, as powerful regional chieftains were brought into a centralized network of control under the Yamato court.

Military strength played a significant role in the Yamato clan's dominance. Archaeological evidence from kofun, or large burial mounds, reveals that these early rulers possessed advanced weaponry, including iron swords and armor, likely influenced by interactions with Korea and China. These military advantages enabled them to assert control over rival clans and protect their growing territory from external threats. The construction of these elaborate burial sites also served as a demonstration of power and legitimacy, reinforcing the Yamato rulers' status as semi-divine figures.