The Tiantai or Heavenly Terrace mountain, the location of the Tiantai sect; its name is attributed to the 三台 six stars at the foot of Ursa Major, under which it is supposed to be, but more likely because of its height and appearance. It gives its name to axian縣 in the Zhejiang taizhou 浙江台州 prefecture, south-west of Ningbo. The monastery, or group of monasteries, was founded there by 智顗 Zhiyi, who is known as 天台大師.