This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Eisai is credited with bringing tea seeds from China on his second journey in 1187, a documented act distinct from the Zen certification he also brought back from the same trip, and with writing Kissa Yojoki, a treatise on tea for health that is recorded as beginning Japan's own tea tradition. That the same journey that made him Japan's first certified Zen teacher also carried the seeds and the written case for a beverage practice with no direct doctrinal content of its own is documented as two separate legacies from one recorded trip, not two names for a single achievement.
Kissa Yojoki argued for tea's medicinal and health benefits, a documented health treatise distinct from a devotional or liturgical text, and its argument is recorded as having circulated independently of the Rinzai teaching Eisai was simultaneously establishing at Hoonji and later Jufukuji. Japan's tea tradition that grew from those seeds and that treatise went on to develop, in later centuries, into a practice with its own aesthetic and ritual elaboration, a lineage documented as tracing back to Eisai's own importation rather than to any single later figure's independent innovation.
That one monk's trip to study Chan Buddhism in China also produced the seeds and the written argument that founded an entire national tea tradition, alongside and separate from the Zen school he is more widely remembered for, marks Kissa Yojoki as a documented case where a single journey left two legacies neither of which reduces to the other.