玉帝

yù dì chuán yù sì hǎi lóng wáng sān nián nèi bù dé xiàng rén jiān jiàng yǔ

玉帝传谕四海龙王，三年内不得向人间降雨。

It is said that once the Jade Emperor ordered the four Sea Dragon Kings not to rain on the earth in three years' time.