Eight great dragon kings

eight great dragon kings
八大竜王 ( Jpn hachidai-ryuo )

    Also, eight dragon kings. Eight dragon kings who assembled at the gathering where Shakyamuni preached the Lotus Sutra, as described in the sutra. Kumarajiva's translation of the Lotus Sutra refers to them by their Sanskrit names:
    Nanda,
    Upananda,
    Sagara,
    Vasuki,
    Takshaka,
    Anavatapta,
    Manasvin,
    and Utpalaka.

 According to the "Introduction" (first) chapter of the Lotus Sutra, each attends the gathering accompanied by several hundreds of thousands of followers.

Source

www.sgilibrary.org